| Fact Group (Combination of Network and Hypercube) | |
| Network: | 306011 - Disclosure - Note F. Part 2. Long-term Debt Components (http://www.abc.com/role/LongTermDebtComponents) |
| Hypercube: | Schedule of Long-term Debt Components [Table] (abc:ScheduleOfLongTermDebtComponentsTable) |
| brm:ConceptMeasure | brm:ReportingEntityMeasure | brm:CalendarTimeMeasure | us-gaap:CreationDateAxis | dei:LegalEntityAxis | FactValue | brm:Units | brm:Rounding |
| us-gaap:DebtCurrent | 0000000001 (http://www.sec.gov/CIK) | 2010-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 22000000 | iso4217:USD | -3 |
| us-gaap:DebtCurrent | 0000000001 (http://www.sec.gov/CIK) | 2009-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 22000000 | iso4217:USD | -3 |
| us-gaap:LongTermDebtAndCapitalLeaseObligations | 0000000001 (http://www.sec.gov/CIK) | 2010-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 19000000 | iso4217:USD | -3 |
| us-gaap:LongTermDebtAndCapitalLeaseObligations | 0000000001 (http://www.sec.gov/CIK) | 2009-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 19000000 | iso4217:USD | -3 |
| us-gaap:LongTermDebt | 0000000001 (http://www.sec.gov/CIK) | 2010-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 41000000 | iso4217:USD | -3 |
| us-gaap:LongTermDebt | 0000000001 (http://www.sec.gov/CIK) | 2009-12-31 | abc:AsReportedFebruary122011Member | dei:EntityDomain | 41000000 | iso4217:USD | -3 |