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Loans Held-for-Sale (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale $ 3,393   $ 3,393   $ 2,576
Net gain on loan sales 94 $ 68 259 $ 242  
Loans held-for-sale, other 40   40   35
Loans held-for-sale          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net gain on loan sales 94 $ 68 244 $ 242  
Consumer loans | Residential first mortgage loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held-for-sale $ 3,400   $ 3,400   $ 2,600