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Investment Securities (Summary of OTTI Credit Losses Recognized in Earnings) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Less: Net OTTI losses realized in net income	$ (24)	$ (35)	$ (96)	$ (108)
Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Less: Net OTTI losses realized in net income	(23)	(30)	(86)	(93)
Asset backed [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Less: Net OTTI losses realized in net income	(1)	(5)	(9)	(14)
Other Debt Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Less: Net OTTI losses realized in net income			$ (1)	$ (1)

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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