| Line | 
           Label | 
           Object Class | 
           Period Type | 
           Balance | 
           Report ElementName | 
        
        
           | 1 | 
           Topics | 
           [Network] | 
           *  | 
           *  | 
           http://www.xbrlsite.com/2015/fro/us-gaap/xbrl/Ontology/topics/role/Topics | 
        
        
           | 2 | 
           Financial Report | 
           Abstract  | 
            | 
            | 
           topics:FinancialReport | 
        
        
           | 3 | 
           Primary Financial Statements | 
           Abstract  | 
            | 
            | 
           topics:PrimaryFinancialStatements | 
        
        
           | 4 | 
           Balance Sheet | 
           Abstract  | 
            | 
            | 
           topics:BalanceSheet | 
        
        
           | 5 | 
           Income Statement | 
           Abstract  | 
            | 
            | 
           topics:IncomeStatement | 
        
        
           | 6 | 
           Cash Flow Statement | 
           Abstract  | 
            | 
            | 
           topics:CashFlowStatement | 
        
        
           | 7 | 
           Statement of Changes in Equity | 
           Abstract  | 
            | 
            | 
           topics:StatementShareholderEquity | 
        
        
           | 8 | 
           Comprehensive Income | 
           Abstract  | 
            | 
            | 
           topics:ComprehensiveIncome | 
        
        
           | 9 | 
           Significant Accounting Policies | 
           Abstract  | 
            | 
            | 
           topics:SignificantAccountingPolicies | 
        
        
           | 10 | 
           Accounting Policies | 
           Abstract  | 
            | 
            | 
           topics:AccountingPolicies | 
        
        
           | 11 | 
           New Accounting Pronouncements | 
           Abstract  | 
            | 
            | 
           topics:NewAccountingPronouncements | 
        
        
           | 12 | 
           Other Accounting Policies Related | 
           Abstract  | 
            | 
            | 
           topics:OtherAccountingPoliciesRelated | 
        
        
           | 13 | 
           Financial Statement Accounts | 
           Abstract  | 
            | 
            | 
           topics:FinancialStatementAccounts | 
        
        
           | 14 | 
           Cash and Cash Equivalents | 
           Abstract  | 
            | 
            | 
           topics:CashAndCashEquivalents | 
        
        
           | 15 | 
           Receivables | 
           Abstract  | 
            | 
            | 
           topics:Receivables | 
        
        
           | 16 | 
           Investments-Debt and Equity Securities | 
           Abstract  | 
            | 
            | 
           topics:DebtAndEquitySecurities | 
        
        
           | 17 | 
           Investments-Equity Method Joint Ventures | 
           Abstract  | 
            | 
            | 
           topics:EquityMethodJointVentures | 
        
        
           | 18 | 
           Investments-Other | 
           Abstract  | 
            | 
            | 
           topics:InvestmentsOther | 
        
        
           | 19 | 
           Inventory | 
           Abstract  | 
            | 
            | 
           topics:Inventory | 
        
        
           | 20 | 
           Other Assets and Deferred Costs | 
           Abstract  | 
            | 
            | 
           topics:DeferredCosts | 
        
        
           | 21 | 
           Property, Plant, and Equipment | 
           Abstract  | 
            | 
            | 
           topics:PropertyPlantAndEquipment | 
        
        
           | 22 | 
           Intangibles-Goodwill and Other | 
           Abstract  | 
            | 
            | 
           topics:IntangibleAssetsGoodwillAndOther | 
        
        
           | 23 | 
           Payables Accruals (Liabilities) | 
           Abstract  | 
            | 
            | 
           topics:PayablesAccruals | 
        
        
           | 24 | 
           Asset Retirement Obligations and Environmental Obligations | 
           Abstract  | 
            | 
            | 
           topics:AssetRetirementObligations | 
        
        
           | 25 | 
           Exit or Disposal Cost Obligations | 
           Abstract  | 
            | 
            | 
           topics:ExitOrDisposalCostObligations | 
        
        
           | 26 | 
           Deferred Revenue | 
           Abstract  | 
            | 
            | 
           topics:DeferredRevenue | 
        
        
           | 27 | 
           Commitments | 
           Abstract  | 
            | 
            | 
           topics:Commitments | 
        
        
           | 28 | 
           Contingencies | 
           Abstract  | 
            | 
            | 
           topics:Contingencies | 
        
        
           | 29 | 
           Guarantees | 
           Abstract  | 
            | 
            | 
           topics:Guarantees | 
        
        
           | 30 | 
           Debt | 
           Abstract  | 
            | 
            | 
           topics:Debt | 
        
        
           | 31 | 
           Temporary Equity (Distinguishing Liabilities from Equity) | 
           Abstract  | 
            | 
            | 
           topics:DistinguishingLiabilitiesFromEquity | 
        
        
           | 32 | 
           Equity | 
           Abstract  | 
            | 
            | 
           topics:Equity | 
        
        
           | 33 | 
           Revenue Recognition | 
           Abstract  | 
            | 
            | 
           topics:RevenueRecognition | 
        
        
           | 34 | 
           Cost of Sales and Services | 
           Abstract  | 
            | 
            | 
           topics:CostOfSalesServices | 
        
        
           | 35 | 
           Compensation-General | 
           Abstract  | 
            | 
            | 
           topics:CompensationRelatedCostsGeneral | 
        
        
           | 36 | 
           Compensation-Nonretirement Postemployment Benefits | 
           Abstract  | 
            | 
            | 
           topics:PostEmploymentButPreRetirementCosts | 
        
        
           | 37 | 
           Compensation-Retirement Benefits | 
           Abstract  | 
            | 
            | 
           topics:PostretirementPensionCosts | 
        
        
           | 38 | 
           Compensation-Stock Compensation | 
           Abstract  | 
            | 
            | 
           topics:StockCompensation | 
        
        
           | 39 | 
           Other Expenses | 
           Abstract  | 
            | 
            | 
           topics:OtherExpenses | 
        
        
           | 40 | 
           Research and Development | 
           Abstract  | 
            | 
            | 
           topics:ResearchAndDevelopmentCosts | 
        
        
           | 41 | 
           Income Taxes | 
           Abstract  | 
            | 
            | 
           topics:IncomeTaxes | 
        
        
           | 42 | 
           Temporary Equity | 
           Abstract  | 
            | 
            | 
           topics:TemporaryEquity | 
        
        
           | 43 | 
           Basis of Financial Statement Presentation | 
           Abstract  | 
            | 
            | 
           topics:BasisOfFinancialStatementPresentation | 
        
        
           | 44 | 
           Organization, Consolidation, and Presentation of Financial Statements | 
           Abstract  | 
            | 
            | 
           topics:OrganizationConsolidationPresentationFinancialStatements | 
        
        
           | 45 | 
           Organization | 
           Abstract  | 
            | 
            | 
           topics:Organization | 
        
        
           | 46 | 
           Consolidation Information | 
           Abstract  | 
            | 
            | 
           topics:ConsolidationInformation | 
        
        
           | 47 | 
           Presentation of Financial Statements | 
           Abstract  | 
            | 
            | 
           topics:PresentationFinancialStatements | 
        
        
           | 48 | 
           Principles of Consolidation | 
           Abstract  | 
            | 
            | 
           topics:PrinciplesOfConsolidation | 
        
        
           | 49 | 
           Basis of Reporting | 
           Abstract  | 
            | 
            | 
           topics:BasisOfReporting | 
        
        
           | 50 | 
           Accounting Changes | 
           Abstract  | 
            | 
            | 
           topics:AccountingChanges | 
        
        
           | 51 | 
           Error Corrections (Prior Period Adjustments) | 
           Abstract  | 
            | 
            | 
           topics:PriorPeriodAdjustments | 
        
        
           | 52 | 
           Changing Prices (Hyperinflation) | 
           Abstract  | 
            | 
            | 
           topics:ChangingPricesHyperinflation | 
        
        
           | 53 | 
           Earnings Per Share | 
           Abstract  | 
            | 
            | 
           topics:EarningsPerShare | 
        
        
           | 54 | 
           Interim Reporting | 
           Abstract  | 
            | 
            | 
           topics:InterimReporting | 
        
        
           | 55 | 
           Risks Uncertainties | 
           Abstract  | 
            | 
            | 
           topics:RisksUncertainties | 
        
        
           | 56 | 
           Segment Reporting | 
           Abstract  | 
            | 
            | 
           topics:SegmentReporting | 
        
        
           | 57 | 
           Use of Estimates | 
           Abstract  | 
            | 
            | 
           topics:UseOfEstimates | 
        
        
           | 58 | 
           Specialized Activities | 
           Abstract  | 
            | 
            | 
           topics:SpecializedActivities | 
        
        
           | 59 | 
           Discontinued Operations | 
           Abstract  | 
            | 
            | 
           topics:DiscontinuedOperations | 
        
        
           | 60 | 
           Broad Transactional Categories | 
           Abstract  | 
            | 
            | 
           topics:BroadTransactionalCategories | 
        
        
           | 61 | 
           Business Combinations | 
           Abstract  | 
            | 
            | 
           topics:BusinessCombinations | 
        
        
           | 62 | 
           Collaborative Arrangements | 
           Abstract  | 
            | 
            | 
           topics:CollaborativeArrangements | 
        
        
           | 63 | 
           Consolidation | 
           Abstract  | 
            | 
            | 
           topics:Consolidation | 
        
        
           | 64 | 
           Derivatives and Hedging | 
           Abstract  | 
            | 
            | 
           topics:DerivativeInstrumentsAndHedgingActivities | 
        
        
           | 65 | 
           Fair Value Measurement | 
           Abstract  | 
            | 
            | 
           topics:FairValueMeasurement | 
        
        
           | 66 | 
           Financial Instruments | 
           Abstract  | 
            | 
            | 
           topics:FinancialInstruments | 
        
        
           | 67 | 
           Foreign Currency Matters | 
           Abstract  | 
            | 
            | 
           topics:ForeignOperationsAndCurrencyTranslation | 
        
        
           | 68 | 
           Interest | 
           Abstract  | 
            | 
            | 
           topics:Interest | 
        
        
           | 69 | 
           Leases-Operating | 
           Abstract  | 
            | 
            | 
           topics:LeasesOperating | 
        
        
           | 70 | 
           Leases-Capital | 
           Abstract  | 
            | 
            | 
           topics:LeasesCapital | 
        
        
           | 71 | 
           Leases-Sale and Leaseback | 
           Abstract  | 
            | 
            | 
           topics:LeasesSaleAndLeaseback | 
        
        
           | 72 | 
           Nonmonetary Transactions | 
           Abstract  | 
            | 
            | 
           topics:NonmonetaryTransactions | 
        
        
           | 73 | 
           Related Party Disclosures | 
           Abstract  | 
            | 
            | 
           topics:RelatedPartyDisclosures | 
        
        
           | 74 | 
           Reorganizations | 
           Abstract  | 
            | 
            | 
           topics:Reorganizations | 
        
        
           | 75 | 
           Subsequent Events | 
           Abstract  | 
            | 
            | 
           topics:SubsequentEvents | 
        
        
           | 76 | 
           Unusual or Infrequent Items | 
           Abstract  | 
            | 
            | 
           topics:UnusualOrInfrequentItems | 
        
        
           | 77 | 
           Extraordinary Items | 
           Abstract  | 
            | 
            | 
           topics:ExtraordinaryItems | 
        
        
           | 78 | 
           Transfers and Servicing | 
           Abstract  | 
            | 
            | 
           topics:TransfersAndServicing | 
        
        
           | 79 | 
           Industry Specific | 
           Abstract  | 
            | 
            | 
           topics:IndustrySpecific | 
        
        
           | 80 | 
           Agriculture | 
           Abstract  | 
            | 
            | 
           topics:Agriculture | 
        
        
           | 81 | 
           Airlines | 
           Abstract  | 
            | 
            | 
           topics:Airlines | 
        
        
           | 82 | 
           Contractors-Construction | 
           Abstract  | 
            | 
            | 
           topics:ContractorsConstruction | 
        
        
           | 83 | 
           Development Stage Entities | 
           Abstract  | 
            | 
            | 
           topics:DevelopmentStageEntities | 
        
        
           | 84 | 
           Entertainment-Broadcasters | 
           Abstract  | 
            | 
            | 
           topics:Broadcasting | 
        
        
           | 85 | 
           Entertainment-Cable Television | 
           Abstract  | 
            | 
            | 
           topics:CableTelevision | 
        
        
           | 86 | 
           Entertainment-Casinos | 
           Abstract  | 
            | 
            | 
           topics:Casinos | 
        
        
           | 87 | 
           Entertainment-Films | 
           Abstract  | 
            | 
            | 
           topics:MotionPictures | 
        
        
           | 88 | 
           Entertainment-Music | 
           Abstract  | 
            | 
            | 
           topics:RecordsAndMusicIndustry | 
        
        
           | 89 | 
           Financial Services-Brokers and Dealers | 
           Abstract  | 
            | 
            | 
           topics:FinancialServicesBrokersAndDealers | 
        
        
           | 90 | 
           Financial Services-Depository and Lending | 
           Abstract  | 
            | 
            | 
           topics:FinancialServicesDepositoryAndLending | 
        
        
           | 91 | 
           Financial Services-Insurance | 
           Abstract  | 
            | 
            | 
           topics:FinancialServicesInsurance | 
        
        
           | 92 | 
           Financial Services-Investment Companies | 
           Abstract  | 
            | 
            | 
           topics:FinancialServicesInvestmentCompanies | 
        
        
           | 93 | 
           Financial Services-Mortgage Banking | 
           Abstract  | 
            | 
            | 
           topics:FinancialServicesMortgageBanking | 
        
        
           | 94 | 
           Financial Services-Title Plant | 
           Abstract  | 
            | 
            | 
           topics:FinancialServicesTitlePlant | 
        
        
           | 95 | 
           Franchisors | 
           Abstract  | 
            | 
            | 
           topics:FranchisorAccounting | 
        
        
           | 96 | 
           Health Care Entities | 
           Abstract  | 
            | 
            | 
           topics:HealthCareEntities | 
        
        
           | 97 | 
           Plan Accounting-Defined Contribution Pension Plans | 
           Abstract  | 
            | 
            | 
           topics:PlanAccountingDefinedContributionPensionPlans | 
        
        
           | 98 | 
           Plan Accounting-Health and Welfare Benefit Plans | 
           Abstract  | 
            | 
            | 
           topics:PlanAccountingHealthWelfareBenefitPlans | 
        
        
           | 99 | 
           Real Estate-General | 
           Abstract  | 
            | 
            | 
           topics:RealEstateOperations | 
        
        
           | 100 | 
           Real Estate-Common Interest Realty Associations | 
           Abstract  | 
            | 
            | 
           topics:RealEstateCommonInterestRealtyAssociations | 
        
        
           | 101 | 
           Real Estate-Real Estate Investment Trusts | 
           Abstract  | 
            | 
            | 
           topics:RealEstateRealEstateInvestmentTrusts | 
        
        
           | 102 | 
           Real Estate-Retail Land | 
           Abstract  | 
            | 
            | 
           topics:RealEstateRetailLand | 
        
        
           | 103 | 
           Real Estate-Time-Sharing Activities | 
           Abstract  | 
            | 
            | 
           topics:RealEstateTimeSharingActivities | 
        
        
           | 104 | 
           Regulated Operations | 
           Abstract  | 
            | 
            | 
           topics:RegulatedOperations | 
        
        
           | 105 | 
           Software | 
           Abstract  | 
            | 
            | 
           topics:Software | 
        
        
           | 106 | 
           U.S. Steamship Entities | 
           Abstract  | 
            | 
            | 
           topics:USSteamshipEntities | 
        
        
           | 107 | 
           Extractive Activities-Oil and Gas | 
           Abstract  | 
            | 
            | 
           topics:ExtractiveActivitiesOilAndGas | 
        
        
           | 108 | 
           Contractors-Federal Government | 
           Abstract  | 
            | 
            | 
           topics:ContractorsFederalGovernment | 
        
        
           | 109 | 
           Depository and Lending | 
           Abstract  | 
            | 
            | 
           topics:DepositoryAndLending | 
        
        
           | 110 | 
           Brokers and Dealers | 
           Abstract  | 
            | 
            | 
           topics:BrokersAndDealers | 
        
        
           | 111 | 
           Insurance | 
           Abstract  | 
            | 
            | 
           topics:Insurance | 
        
        
           | 112 | 
           Investment Companies | 
           Abstract  | 
            | 
            | 
           topics:InvestmentCompanies | 
        
        
           | 113 | 
           Mortgage Banking | 
           Abstract  | 
            | 
            | 
           topics:MortgageBanking | 
        
        
           | 114 | 
           Extractive Activities-Mining | 
           Abstract  | 
            | 
            | 
           topics:ExtractiveActivitiesMining | 
        
        
           | 115 | 
           Not-for-Profit Entities | 
           Abstract  | 
            | 
            | 
           topics:NotForProfitEntities | 
        
        
           | 116 | 
           Plan Accounting-Defined Benefit Pension Plans | 
           Abstract  | 
            | 
            | 
           topics:PlanAccountingDefinedBenefitPensionPlans | 
        
        
           | 117 | 
           Commercial and Industrial | 
           Abstract  | 
            | 
            | 
           topics:CommercialAndIndustrial | 
        
        
           | 118 | 
           Document and Entity Information | 
           Abstract  | 
            | 
            | 
           topics:DocumentAndEntityInformation | 
        
        
           | 119 | 
           Document Information | 
           Abstract  | 
            | 
            | 
           topics:DocumentInformation | 
        
        
           | 120 | 
           Entity Information | 
           Abstract  | 
            | 
            | 
           topics:EntityInformation | 
        
        
           | 121 | 
           Supplementary Information | 
           Abstract  | 
            | 
            | 
           topics:SupplementaryInformation | 
        
        
           | 122 | 
           Other Information | 
           Abstract  | 
            | 
            | 
           topics:OtherInformation |