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Goodwill and Other Intangible Assets (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) (Mortgage Servicing Rights [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Commercial Real Estate [Member]
       
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Assumption [Line Items]        
Fair Value $ 410 $ 471    
Weighted-average life 5 years 6 months 5 years 11 months    
Weighted-average constant prepayment rate 6.57% 5.08%    
Decline in fair value from 10% adverse change in prepayment rate 9 6    
Decline in fair value from 20% adverse change in prepayment rate 18 11    
Effective Discount Rate 7.74% 7.92%    
Decline in fair value from 10% adverse change in interest rate 11 9    
Decline in fair value from 20% adverse change in interest rate 22 18    
Residential Mortgages [Member]
       
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Assumption [Line Items]        
Fair Value 594 647 684 1,033
Weighted-average life 3 years 10 months 3 years 7 months    
Weighted-average constant prepayment rate 20.75% 22.10%    
Decline in fair value from 10% adverse change in prepayment rate 44 44    
Decline in fair value from 20% adverse change in prepayment rate 84 84    
Residential Mortgages [Member] | Weighted Average Option Adjusted Spread [Member]
       
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Assumption [Line Items]        
Other assumptions or inputs 11.25% 11.77%    
Decline in fair value from 10% adverse change in interest rate 23 25    
Decline in fair value from 20% adverse change in interest rate $ 45 $ 48