Condensed Consolidated Statement Of Cash Flows (Parenthetical) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Statement of Cash Flows [Abstract]
Cash and cash equivalents of business units at the time of disposition	$ 147	$ 88

Cash and cash equivalents of business units at the time of disposition

No definition available.

Name:	gjm_CashAndCashEquivalentsOfBusinessUnitsAtTimeOfDisposition
Namespace Prefix:	gjm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration