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Loans and Allowance for Loan Losses (Details 3) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Loan losses allowance            
Individually evaluated for impairment $ 50   $ 42      
Collectively evaluated for impairment 557   610      
Purchased credit-impaired loans 1   1      
Total allowance for loan losses 608 625 653 668 656 764
Loans held for investment:            
Individually evaluated for impairment 620   627      
Collectively evaluated for impairment 65,291   58,227      
Purchased credit-impaired loans 1,259   1,180      
Total loans held for investment 67,170   60,034      
Commercial portfolio
           
Loan losses allowance            
Individually evaluated for impairment 32   24      
Collectively evaluated for impairment 422   394      
Total allowance for loan losses 454 480 418 372 388 474
Loans held for investment:            
Individually evaluated for impairment 290   330      
Collectively evaluated for impairment 37,567   32,167      
Total loans held for investment 37,857   32,497      
Consumer portfolio
           
Loan losses allowance            
Individually evaluated for impairment 18   18      
Collectively evaluated for impairment 51   106      
Total allowance for loan losses 69 106 124 116 126 138
Loans held for investment:            
Individually evaluated for impairment 326   292      
Collectively evaluated for impairment 27,724   26,060      
Total loans held for investment 28,050   26,352      
Purchased credit-impaired loans
           
Loan losses allowance            
Purchased credit-impaired loans 1   1      
Total allowance for loan losses 1 1 1 12 4 17
Loans held for investment:            
Individually evaluated for impairment 4   5      
Purchased credit-impaired loans 1,259   1,180      
Total loans held for investment 1,263   1,185      
Unallocated portfolio
           
Loan losses allowance            
Collectively evaluated for impairment 84   110      
Total allowance for loan losses $ 84 $ 38 $ 110 $ 168 $ 138 $ 135