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Investment Securities (Summary of OTTI Noncredit Losses Included in Accumulated Other Comprehensive Loss) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Investment Securities Disclosure [Abstract]    
Noncredit Portion Of Other Than Temporary Impairments$ (87)[1]$ (46)[1]$ (117)[1]$ (194)[1]
[1]Included in accumulated other comprehensive income (loss).