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Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total comprehensive income (loss)	$ 426	$ 224	$ (10)
Increase in total comprehensive income	202
Increase in net income	116
Increase in net unrealized gains on investment securities available-for-sale, net of tax	$ 112

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 economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including 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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