| Fact Group (Combination of Network and Hypercube) | |
| Network: | 154104 - Statement - Statement of Changes in Equity, Treasury Stock (http://www.abc.com/role/StatementOfChangesInEquityTreasuryStock) |
| Hypercube: | Changes in Treasury Stock [Table] (abc:ChangesInTreasuryStockTable) |
| Slicers (applies to each fact value in each table cell) | |
| brm:ReportingEntityMeasure | 0000000001 (http://www.sec.gov/CIK) |
| us-gaap:CreationDateAxis | abc:AsReportedFebruary122011Member |
| dei:LegalEntityAxis | dei:EntityDomain |
| brm:Units | iso4217:USD |
| brm:CalendarTimeMeasure | |||||
| brm:ConceptMeasure | 2008-12-31 | 2009-01-01/2009-12-31 | 2009-12-31 | 2010-01-01/2010-12-31 | 2010-12-31 |
| Changes in Treasury Stock [Line Items] | |||||
| Treasury Stock [Roll Forward] | |||||
| Treasury Stock, Value, Beginning Balance | 2,000,000 | 2,000,000 | 2,000,000 | ||
| Treasury Stock, Period Increase (Decrease) | 0 | 0 | |||
| Treasury Stock, Value, Ending Balance | 2,000,000 | 2,000,000 | 2,000,000 | ||