Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Comprehensive Income
Net income	$ 96	$ 501
Other comprehensive income (loss)
Change in net unrealized gain / loss on securities	241	322
Change in OTTI losses recognized in other comprehensive income	(8)	5
Change in net gain / loss on cash-flow hedging instruments	(53)	(68)
Change in foreign currency translation adjustments	(136)	(29)
Change in pension and other postretirement plan adjustments	33	22
Total other comprehensive income	77	252
Total comprehensive income	$ 173	$ 753

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Name:	us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration