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Gross Realized Gains and Losses on Sales and OTTI on Securities Available for Sale (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Gross realized gains	$ 4	$ 69	$ 180	$ 147
Gross realized losses	(2)	0	(80)	(17)
OTTI	0	0	(2)	(2)
Net securities gains	$ 2	$ 69	$ 98	$ 128

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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