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Mortgage Servicing Rights (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Up Scenario [Member]
MSR portfolio [Member]
Dec. 31, 2011
Up Scenario [Member]
MSR portfolio [Member]
Jun. 30, 2012
Up Scenario [Member]
Derivative instrument hedges [Member]
Dec. 31, 2011
Up Scenario [Member]
Derivative instrument hedges [Member]
Jun. 30, 2012
Up Scenario [Member]
Net Sensitivity [Member]
Dec. 31, 2011
Up Scenario [Member]
Net Sensitivity [Member]
Jun. 30, 2012
Down Scenario [Member]
MSR portfolio [Member]
Dec. 31, 2011
Down Scenario [Member]
MSR portfolio [Member]
Jun. 30, 2012
Down Scenario [Member]
Derivative instrument hedges [Member]
Dec. 31, 2011
Down Scenario [Member]
Derivative instrument hedges [Member]
Jun. 30, 2012
Down Scenario [Member]
Net Sensitivity [Member]
Dec. 31, 2011
Down Scenario [Member]
Net Sensitivity [Member]
Changes in fair value of capitalized MSRs                                
Balance at beginning of period $ 1,737 $ 2,073 $ 1,519 $ 1,837                        
Rights purchased 16 4 29 11                        
Rights capitalized 215 102 476 315                        
Changes in fair value of MSRs                                
Due to fluctuations in market interest rates (239) (137) (175) (35)                        
Due to revised assumptions or models (18) 25 (17) 25                        
Other changes in fair value (117) (78) (238) (164)                        
Balance at end of period 1,594 1,989 1,594 1,989                        
Sensitivity to the changes in interest rates of the fair value of the MSRs portfolio and the related derivative instruments                                
Net fair value 100 basis points         484 460 (440) (445) 44 15 (304) (305) 430 378 126 73
Net fair value 50 basis points         240 223 (220) (217) 20 6 (189) (183) 222 204 33 21
Net fair value 25 basis points         $ 116 $ 107 $ (110) $ (107) $ 6 $ 0 $ (103) $ (98) $ 111 $ 104 $ 8 $ 6