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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value $ 3,128   $ 3,128   $ 4,026
Loans and leases, measured at fair value 6,285   6,285   7,085
Other assets, measured at fair value 19,341   19,341   $ 13,802
Nonrecurring          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Gains (Losses) on loans held-for-sale 0 $ (1) (4) $ (44)  
Gains (Losses) on loans and leases (152) (143) (307) (399)  
Gains (Losses) on foreclosed properties (21) (23) (35) (41)  
Gains (Losses) on other assets (1) (18) (121) (44)  
Nonrecurring | Government Guaranteed Mortgage Loans upon Foreclosure Receivable          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Foreclosed properties, measured at fair value 879 1,300 879 1,300  
Nonrecurring | Level 2          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value 70 191 70 191  
Loans and leases, measured at fair value 0 0 0 0  
Foreclosed properties, measured at fair value 0 0 0 0  
Other assets, measured at fair value 353 173 353 173  
Loss on loans and leases written down to zero 71 48 132 112  
Nonrecurring | Level 3          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value 16 48 16 48  
Loans and leases, measured at fair value 813 1,333 813 1,333  
Foreclosed properties, measured at fair value 79 113 79 113  
Other assets, measured at fair value $ 0 $ 0 $ 0 $ 0