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Mortgage Banking Activities, Liability for Mortgage Loan Repurchase Losses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Liability For Mortgage Loan Repurchase Losses [Abstract]    
Balance, beginning of period $ 2,206 $ 1,326
Provision for repurchase losses:    
Loan sales 59 62
Change in estimate 250 368
Total additions 309 430
Losses (198) (312)
Balance, end of period $ 2,317 $ 1,444