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Investment Securities (Schedule Of Credit-Related Loss Activity Recognized In Earnings) (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Investment Securities  
Beginning balance$ 63$ 175
Plus expected credit-related losses for which other-than-temporary impairment was not previously recognized987
Plus expected credit-related losses for which other-than-temporary impairment was previously recognized39136
Less losses realized for securities sold(13)(8)
Less losses related to securities intended or required to be sold(2)(1)
Ending balance$ 96$ 389