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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 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Gross realized gains $ 33 $ 62 $ 176 $ 77
Gross realized losses   (4) (78) (17)
OTTI (1) (1) (2) (2)
Net securities gains $ 32 $ 57 $ 96 $ 58