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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Related Loan Balances by Portfolio Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Loan losses allowance            
Individually evaluated for impairment $ 107   $ 168      
Collectively evaluated for impairment 435   471      
Total allowance for loan losses 542 $ 513 639 $ 691 $ 748 $ 723
Loans held for investment:            
Individually evaluated for impairment 837   1,022      
Collectively evaluated for impairment 77,992   76,529      
Loans held for investment [1] 78,829   77,551      
Commercial            
Loan losses allowance            
Individually evaluated for impairment 92   151      
Collectively evaluated for impairment 339   405      
Total allowance for loan losses 431 435 556 614 683 653
Loans held for investment:            
Individually evaluated for impairment 495   636      
Collectively evaluated for impairment 40,761   43,470      
Loans held for investment 41,256   44,106      
Consumer            
Loan losses allowance            
Individually evaluated for impairment 15   17      
Collectively evaluated for impairment 66   66      
Total allowance for loan losses 81 78 83 77 65 50
Loans held for investment:            
Individually evaluated for impairment 342   386      
Collectively evaluated for impairment 37,231   33,059      
Loans held for investment 37,573   33,445      
Unallocated            
Loan losses allowance            
Individually evaluated for impairment 0          
Collectively evaluated for impairment 30          
Total allowance for loan losses 30 $ 0 $ 0 $ 0 $ 0 $ 20
Loans held for investment:            
Individually evaluated for impairment 0          
Collectively evaluated for impairment 0          
Loans held for investment $ 0          
[1] Includes $277 million and $180 million at September 30, 2017 and December 31, 2016, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.