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Fair Values of Assets and Liabilities (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Assets, Fair Value Disclosure        
Mortgage servicing rights $ 1,737 $ 1,519 $ 2,073 $ 1,837
Fair Value, Measurements, Recurring [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 52,749 51,937    
Mortgage loans held for sale 5,062 6,925    
Mortgage servicing rights 1,737 1,519    
Derivative assets 1,429 1,619    
Other assets 749 613    
Total 61,726 62,613    
Liabilities, Fair Value Disclosure        
Derivative liabilities 456 665    
Other liabilities 590 613    
Total 1,046 1,278    
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 861 1,057    
Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 6,509 6,539    
Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 6 6    
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 885 827    
Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 357 318    
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 236 202    
Fair Value, Measurements, Recurring [Member] | Residential [Member] | Agency [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 41,276 40,314    
Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-agency Prime [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 733 803    
Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-agency Non-Prime [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 806 802    
Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Commercial Mortgage-backed Agency Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 138 140    
Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Commercial Mortgage-backed Non-Agency Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 40 42    
Fair Value, Measurements, Recurring [Member] | Asset backed Securities [Member] | Collateralized Loan Obligations [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 206 206    
Fair Value, Measurements, Recurring [Member] | Asset backed Securities [Member] | Other [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 696 681    
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 768 755    
Other assets 119 146    
Total 887 901    
Liabilities, Fair Value Disclosure        
Other liabilities 114 75    
Total 114 75    
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 543 562    
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 225 193    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 50,162 49,289    
Mortgage loans held for sale 5,062 6,925    
Derivative assets 587 632    
Other assets 630 467    
Total 56,441 57,313    
Liabilities, Fair Value Disclosure        
Derivative liabilities 2,197 2,501    
Other liabilities 476 538    
Total 2,673 3,039    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 318 495    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-backed Agency Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 138      
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 87      
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 6,509 6,539    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 6 6    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 876 818    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 357 318    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 11 9    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Agency [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 41,276 40,314    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Commercial Mortgage-backed Agency Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities   140    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Asset backed Securities [Member] | Collateralized Loan Obligations [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities   86    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Asset backed Securities [Member] | Other [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 584 564    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 1,819 1,893    
Mortgage servicing rights 1,737 1,519    
Derivative assets 1,146 1,281    
Total 4,702 4,693    
Liabilities, Fair Value Disclosure        
Derivative liabilities 57 53    
Total 57 53    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-backed Non-Agency Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 40      
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 9 9    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-agency Prime [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 733 803    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-agency Non-Prime [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 806 802    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Commercial Mortgage-backed Non-Agency Securities [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities   42    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset backed Securities [Member] | Collateralized Loan Obligations [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 119 120    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset backed Securities [Member] | Other [Member]
       
Assets, Fair Value Disclosure        
Available-for-sale securities 112 117    
Netting [Member] | Fair Value, Measurements, Recurring [Member]
       
Assets, Fair Value Disclosure        
Derivative assets (304) (294)    
Total (304) (294)    
Liabilities, Fair Value Disclosure        
Derivative liabilities (1,798) (1,889)    
Total $ (1,798) $ (1,889)