-Network: (00 - Document - Document and Company Information)

-Document And Company Information [Abstract] {ID1}

Entity Registrant Name {ID2}

Entity Central Index Key {ID3}

Document Type {ID4}

Document Period End Date {ID5}

Amendment Flag {ID6}

Current Fiscal Year End Date {ID7}

Entity Well-known Seasoned Issuer {ID8}

Entity Voluntary Filers {ID9}

Entity Current Reporting Status {ID10}

Entity Filer Category {ID11}

Entity Public Float {ID12}

Entity Common Stock, Shares Outstanding {ID13}

-Network: (01 - Statement - Statement of Consolidated Operations)

-Statement of Operations [Abstract] {ID14}

-Statement [Table] {ID15}

-Statement [Line Items] {ID16}

-REVENUES AND OTHER: {ID17}

Oil and gas production revenues {ID18}

Other {ID19}

Total revenues and other {ID20}

-OPERATING EXPENSES: {ID21}

-Depreciation depletion and amortization {ID22}

Recurring {ID23}

Additional {ID24}

Asset retirement obligation accretion {ID25}

Lease operating expenses {ID26}

Gathering and transportation {ID27}

Taxes other than income {ID28}

General and administrative {ID29}

Financing costs, net: {ID30}

Total operating expenses {ID31}

INCOME (LOSS) BEFORE INCOME TAXES {ID32}

Current income tax provision {ID33}

Deferred income tax provision (benefit) {ID34}

NET INCOME (LOSS) {ID35}

Preferred stock dividends {ID36}

INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK {ID37}

-NET INCOME (LOSS) PER COMMON SHARE: {ID38}

Basic {ID39}

Diluted {ID40}

-Network: (02 - Statement - Statement of Consolidated Cash Flows)

-Statements of Cash Flows [Abstract] {ID41}

-Statement [Table] {ID42}

-Statement [Line Items] {ID43}

-CASH FLOWS FROM OPERATING ACTIVITIES: {ID44}

Net Income (Loss) {ID45}

-Adjustments to reconcile net income (loss) to net cash provided by operating activities: {ID46}

Depreciation, depletion and amortization {ID47}

Asset retirement obligation accretion {ID48}

Provision for (benefit from) deferred income taxes {ID49}

Other {ID50}

-Changes in operating assets and liabilities: {ID51}

Receivables {ID52}

Inventories {ID53}

Advances and other {ID54}

Deferred charges and other {ID55}

Accounts payable {ID56}

Accrued expenses {ID57}

Deferred credits and noncurrent liabilities {ID58}

NET CASH PROVIDED BY OPERATING ACTIVITIES {ID59}

-CASH FLOWS FROM INVESTING ACTIVITIES: {ID60}

Additions to oil and gas property {ID61}

Additions to gas gathering, transmission and processing facilities {ID62}

Acquisition of Marathon properties {ID63}

Short-term investments {ID64}

Restricted cash {ID65}

Proceeds from sale of oil and gas properties {ID66}

Other, net {ID67}

NET CASH USED IN INVESTING ACTIVITIES {ID68}

-CASH FLOWS FROM FINANCING ACTIVITIES: {ID69}

Commercial paper, credit facility and bank notes, net {ID70}

Payments on fixed-rate notes {ID71}

Dividends paid {ID72}

Common stock activity {ID73}

Treasury stock activity, net {ID74}

Cost of debt and equity transactions {ID75}

Other {ID76}

NET CASH USED IN FINANCING ACTIVITIES {ID77}

NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS {ID78}

CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR {ID79}

CASH AND CASH EQUIVALENTS AT END OF PERIOD {ID80}

-SUPPLEMENTARY CASH FLOW DATA: {ID81}

Interest paid, net of capitalized interest {ID82}

Income taxes paid, net of refunds {ID83}

-Network: (03 - Statement - Consolidated Balance Sheet)

-Balance Sheets [Abstract] {ID84}

-Statement [Table] {ID85}

-Statement [Line Items] {ID86}

-ASSETS {ID87}

-CURRENT ASSETS: {ID88}

Cash and cash equivalents {ID89}

Short-term investments {ID90}

Receivables, net of allowance {ID91}

Inventories {ID92}

Drilling advances {ID93}

Derivative instruments {ID94}

Prepaid taxes {ID95}

Prepaid assets and other {ID96}

Total current assets {ID97}

-PROPERTY AND EQUIPMENT: {ID98}

-Oil and gas, on the basis of full-cost accounting: {ID99}

Proved properties {ID100}

Unproved properties and properties under development, not being amortized {ID101}

Gas gathering, transmission and processing facilities {ID102}

Other {ID103}

Total property and equipment, gross {ID104}

Less: Accumulated depreciation, depletion and amortization {ID105}

Total property and equipment, net {ID106}

-OTHER ASSETS: {ID107}

Restricted cash {ID108}

Goodwill, net {ID109}

Deferred charges and other {ID110}

Total assets {ID111}

-LIABILITIES AND SHAREHOLDERS' EQUITY {ID112}

-CURRENT LIABILITIES: {ID113}

Accounts payable {ID114}

Accrued operating expense {ID115}

Accrued exploration and development {ID116}

Accrued compensation and benefits {ID117}

Accrued interest {ID118}

Accrued income taxes {ID119}

Current debt {ID120}

Asset retirement obligation {ID121}

Other {ID122}

Total current liabilities {ID123}

LONG-TERM DEBT {ID124}

-DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES: {ID125}

Income taxes {ID126}

Asset retirement obligation {ID127}

Other {ID128}

Deferred Credits Other Noncurrent Liabilities {ID129}

COMMITMENTS AND CONTINGENCIES {ID130}

-SHAREHOLDERS' EQUITY: {ID131}

Preferred stock, no par value, 5,000,000 shares authorized - Series B, 5.68% Cumulative, $100 million aggregate liquidation value, 100,000 shares issued and outstanding {ID132}

Common stock, $0.625 par, 430,000,000 shares authorized, 343,613,544 and 342,754,114 shares issued, respectively {ID133}

Paid-in capital {ID134}

Retained earnings {ID135}

Treasury stock, at cost, 7,866,467 and 8,044,050 shares, respectively {ID136}

Accumulated other comprehensive income (loss) {ID137}

Total shareholders' equity {ID138}

Total Liabilities and Shareholders' Equity {ID139}

-Class of Stock [Axis] {ID140}

-Class of Stock [Domain] {ID141}

-Common Stock {ID142}

Common Class A [Member] {ID143}

Common Class B [Member] {ID144}

Nonvoting Common Stock [Member] {ID145}

Convertible Common Stock [Member] {ID146}

-Series B Preferred Stock {ID147}

Cumulative Preferred Stock [Member] {ID148}

Noncumulative Preferred Stock [Member] {ID149}

Redeemable Preferred Stock [Member] {ID150}

Nonredeemable Preferred Stock [Member] {ID151}

-Convertible Preferred Stock [Member] {ID152}

Nonredeemable Convertible Preferred Stock [Member] {ID153}

Redeemable Convertible Preferred Stock [Member] {ID154}

Preferred Class A [Member] {ID155}

Preferred Class B [Member] {ID156}

Series A Preferred Stock [Member] {ID157}

Series B Preferred Stock [Member] {ID158}

Series C Preferred Stock [Member] {ID159}

Series D Preferred Stock [Member] {ID160}

Series E Preferred Stock [Member] {ID161}

Series F Preferred Stock [Member] {ID162}

Series G Preferred Stock [Member] {ID163}

Series H Preferred Stock [Member] {ID164}

-Network: (031 - Statement - Consolidated Balance Sheet (Parenthetical))

-Balance Sheet (Parenthetical) [Abstract] {ID165}

-Statement [Table] {ID166}

-Statement [Line Items] {ID167}

Preferred stock, par value {ID168}

Preferred stock, shares authorized {ID169}

Preferred stock, shares issued {ID170}

Preferred stock, shares outstanding {ID171}

Common stock, par value {ID172}

Common stock, shares authorized {ID173}

Common stock, shares issued {ID174}

Treasury stock, shares {ID175}

Cumulative preferred stock-Series B, liquidation value {ID176}

-Class of Stock [Axis] {ID177}

-Class of Stock [Domain] {ID178}

-Common Stock {ID179}

Common Class A [Member] {ID180}

Common Class B [Member] {ID181}

Nonvoting Common Stock [Member] {ID182}

Convertible Common Stock [Member] {ID183}

-Series B Preferred Stock {ID184}

Cumulative Preferred Stock [Member] {ID185}

Noncumulative Preferred Stock [Member] {ID186}

Redeemable Preferred Stock [Member] {ID187}

Nonredeemable Preferred Stock [Member] {ID188}

-Convertible Preferred Stock [Member] {ID189}

Nonredeemable Convertible Preferred Stock [Member] {ID190}

Redeemable Convertible Preferred Stock [Member] {ID191}

Preferred Class A [Member] {ID192}

Preferred Class B [Member] {ID193}

Series A Preferred Stock [Member] {ID194}

Series B Preferred Stock [Member] {ID195}

Series C Preferred Stock [Member] {ID196}

Series D Preferred Stock [Member] {ID197}

Series E Preferred Stock [Member] {ID198}

Series F Preferred Stock [Member] {ID199}

Series G Preferred Stock [Member] {ID200}

Series H Preferred Stock [Member] {ID201}

-Network: (04 - Statement - Statement of Shareholders Equity)

-Statement of Shareholders' Equity [Abstract] {ID202}

-Statement [Table] {ID203}

-Statement [Line Items] {ID204}

-Comprehensive income (loss): {ID205}

Net income (loss) {ID206}

Commodity hedges, net {ID207}

Comprehensive income (loss) {ID208}

-Dividends: {ID209}

Preferred {ID210}

Common $.30 and $.40 per share for 2009 and 2008 respectively {ID211}

Common shares issued {ID212}

Treasury shares issued, net {ID213}

Compensation expense {ID214}

FIN 48 {ID215}

Other {ID216}

Beginning Balance {ID217}

Ending Balance {ID218}

-Statement, Equity Components [Axis] {ID219}

-Equity Component [Domain] {ID220}

Common Stock {ID221}

Series B Preferred Stock {ID222}

Capital Units [Member] {ID223}

Common Stock Including Additional Paid in Capital [Member] {ID224}

Preferred Stock Including Additional Paid in Capital [Member] {ID225}

Paid-In Capital {ID226}

Treasury Stock {ID227}

-Retained Earnings {ID228}

Retained Earnings, Appropriated [Member] {ID229}

Retained Earnings, Unappropriated [Member] {ID230}

Undistributed Income from Other than Gain or Loss on Sale of Properties [Member] {ID231}

Undistributed Net Realized Gain or Loss on Sale of Properties [Member] {ID232}

-Accumulated Other Comprehensive Income (Loss) {ID233}

Accumulated Net Unrealized Investment Gain (Loss) [Member] {ID234}

Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] {ID235}

Accumulated Translation Adjustment [Member] {ID236}

Accumulated Defined Benefit Plans Adjustment [Member] {ID237}

Comprehensive Income (Loss) {ID238}

-Network: (041 - Statement - Statement of Shareholders Equity (Parenthetical))

-Statement of Shareholders' Equity (Parenthetical) [Abstract] {ID239}

-Statement [Table] {ID240}

-Statement [Line Items] {ID241}

Common stock, dividends, per Share {ID242}

Income tax expenses to commodity hedges {ID243}

-Statement, Equity Components [Axis] {ID244}

-Equity Component [Domain] {ID245}

Common Stock {ID246}

Series B Preferred Stock {ID247}

Capital Units [Member] {ID248}

Common Stock Including Additional Paid in Capital [Member] {ID249}

Preferred Stock Including Additional Paid in Capital [Member] {ID250}

Paid-In Capital {ID251}

Treasury Stock {ID252}

-Retained Earnings {ID253}

Retained Earnings, Appropriated [Member] {ID254}

Retained Earnings, Unappropriated [Member] {ID255}

Undistributed Income from Other than Gain or Loss on Sale of Properties [Member] {ID256}

Undistributed Net Realized Gain or Loss on Sale of Properties [Member] {ID257}

-Accumulated Other Comprehensive Income (Loss) {ID258}

Accumulated Net Unrealized Investment Gain (Loss) [Member] {ID259}

Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] {ID260}

Accumulated Translation Adjustment [Member] {ID261}

Accumulated Defined Benefit Plans Adjustment [Member] {ID262}

Comprehensive Income (Loss) {ID263}

-Network: (0601 - Disclosure - General Accounting Description)

-General Accounting Description [Abstract] {ID264}

General Accounting Description {ID265}

-Network: (0602 - Disclosure - Summary of Significant Accounting Policies)

-Summary of Significant Accounting Policies [Abstract] {ID266}

Significant Accounting Policies {ID267}

-Network: (0603 - Disclosure - Derivative Instruments and Hedging Activities)

-Derivative Instruments and Hedging Activities [Abstract] {ID268}

Derivative Instruments and Hedging Activities {ID269}

-Network: (0604 - Disclosure - Debt)

-Debt [Abstract] {ID270}

Debt {ID271}

-Network: (0605 - Disclosure - Income taxes)

-Income Taxes [Abstract] {ID272}

Income Taxes {ID273}

-Network: (0606 - Disclosure - Capital Stock)

-Capital Stock [Abstract] {ID274}

Capital Stock {ID275}

-Network: (0607 - Disclosure - Asset Retirement Obligation)

-Asset Retirement Obligation [Abstract] {ID276}

Asset Retirement Obligation {ID277}

-Network: (0608 - Disclosure - Commitments and Contingencies)

-Commitments And Contingencies [Abstract] {ID278}

Commitments and Contingencies {ID279}

-Network: (0609 - Disclosure - Subsequent Events)

-Subsequent Events [Abstract] {ID280}

Subsequent Events {ID281}

-Network: (0610 - Disclosure - Fair Value Measurements)

-Fair Value Measurements [Abstract] {ID282}

Fair Value Measurements {ID283}

-Network: (0611 - Disclosure - Business Segment Information)

-Business Segment Information [Abstract] {ID284}

Business Segment Information {ID285}

-Network: (0612 - Disclosure - Supplemental Guarantor Information)

-Supplemental Guarantor Information [Abstract] {ID286}

Supplemental Guarantor Information {ID287}

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