Securities Available for Sale, Other-Than-Temporary Impaired Debt Securities (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Securities available for sale	$ 189	$ 106	$ 269	$ 212
Total recorded directly to OCI for increase (decrease) in non-credit-related impairment (1)	(60)	(57)	(216)	5
Total OTTI losses recorded on debt securities	129	49	53	203
Debt Securities [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Securities available for sale	189	106	269	198
Credit-related OTTI [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Securities available for sale	189	106	268	195
Other than temporary impairment on securities we intend to sell [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Securities available for sale	0	0	1	3
US States and Political Subdivisions [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Total recorded directly to OCI for increase (decrease) in non-credit-related impairment (1)	(1)	(1)	(1)	(5)
Residential [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Securities available for sale	144	37	206	76
Total recorded directly to OCI for increase (decrease) in non-credit-related impairment (1)	(64)	(124)	(168)	(98)
Commercial [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Total recorded directly to OCI for increase (decrease) in non-credit-related impairment (1)	17	84	(36)	82
Collateralized debt obligations [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Total recorded directly to OCI for increase (decrease) in non-credit-related impairment (1)	0	(3)	0	56
Other Debt Securities [Member]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Total recorded directly to OCI for increase (decrease) in non-credit-related impairment (1)	$ (12)	$ (13)	$ (11)	$ (30)

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The amount of other than temporary impairment (OTTI) loss on a debt security, categorized as Available-for-sale, related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis. This amount of other than temporary losses on Available-for-sale Securities is attributable to the noncontrolling interest.

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- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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