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Intangible Assets (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Fair value of MSRs:        
Beginning balance $ 228 $ 396 $ 220 $ 394
Additions related to loan sales 6 9 14 25
Changes in fair value due to:        
Change in valuation inputs or assumptions used in the valuation models (31) (27) (15) (22)
Realization of cash flows (16) (15) (32) (34)
Ending Balance $ 187 $ 363 $ 187 $ 363