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Loans and Allowance for Loan Losses (Details 3) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Loan losses allowance            
Individually evaluated for impairment $ 63   $ 39      
Collectively evaluated for impairment 493   528      
Purchased credit-impaired loans 3   1      
Total allowance for loan losses 559 557 568 625 638 653
Loans held for investment:            
Individually evaluated for impairment 620   608      
Collectively evaluated for impairment 70,967   66,601      
Purchased credit-impaired loans 782   1,103      
Total loans held for investment 72,369   68,312      
Commercial portfolio
           
Loan losses allowance            
Individually evaluated for impairment 43   19      
Collectively evaluated for impairment 439   402      
Total allowance for loan losses 482 479 421 480 486 418
Loans held for investment:            
Individually evaluated for impairment 284   266      
Collectively evaluated for impairment 40,504   38,113      
Total loans held for investment 40,788   38,379      
Consumer portfolio
           
Loan losses allowance            
Individually evaluated for impairment 20   20      
Collectively evaluated for impairment 29   49      
Total allowance for loan losses 49 55 69 106 113 124
Loans held for investment:            
Individually evaluated for impairment 334   339      
Collectively evaluated for impairment 30,463   28,488      
Total loans held for investment 30,797   28,827      
Purchased credit-impaired loans
           
Loan losses allowance            
Purchased credit-impaired loans 3   1      
Total allowance for loan losses 3 3 1 1 1 1
Loans held for investment:            
Individually evaluated for impairment 2   3      
Purchased credit-impaired loans 782   1,103      
Total loans held for investment 784   1,106      
Unallocated portfolio
           
Loan losses allowance            
Collectively evaluated for impairment 25   77      
Total allowance for loan losses $ 25 $ 20 $ 77 $ 38 $ 38 $ 110