Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value (Details)

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Fair Value Measurements - Nonrecurring Fair Value (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity method investment, pre-tax impairment charge     $ 2,072 $ 0  
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale $ 5,011   5,011   $ 2,942
Loans and leases 7,674   7,674   4,349
Other assets 22,952   22,952   19,739
Nonrecurring          
Gains (Losses)          
Loans held-for-sale (7) $ (2) (18) (2)  
Loans and leases (21) (63) (62) (194)  
Foreclosed properties (7) (8) (10) (22)  
Other assets (2,085) (22) (2,104) (58)  
Loss on loans and leases written down to zero 8 24 25 76  
Nonrecurring | Government Guaranteed Mortgage Loans upon Foreclosure Receivable          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Foreclosed properties 275 500 275 500  
Nonrecurring | Level 2          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale 5 45 5 45  
Loans and leases 0 0 0 0  
Foreclosed properties 0 0 0 0  
Other assets 165 294 165 294  
Nonrecurring | Level 3          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale 111 12 111 12  
Loans and leases 232 492 232 492 $ 474
Foreclosed properties 19 87 19 87  
Other assets 658 $ 3 $ 658 $ 3  
Merchant Servicing Joint Venture          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity method investment, pre-tax impairment charge $ 2,100