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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value $ 2,845   $ 2,845   $ 2,156
Loans and leases, measured at fair value 6,227   6,227   5,710
Other assets, measured at fair value 21,883   21,883   $ 22,581
Nonrecurring          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Gains (Losses) on loans held-for-sale 0 $ 0 (2) $ 0  
Gains (Losses) on loans and leases (80) (105) (156) (201)  
Gains (Losses) on foreclosed properties (25) (26) (32) (35)  
Gains (Losses) on other assets (31) (55) (35) (137)  
Loss on loans and leases written down to zero 31 43 64 78  
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 573 1,000 573 1,000  
Nonrecurring | Level 2          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value 179 64 179 64  
Loans and leases, measured at fair value 0 0 0 0  
Foreclosed properties, measured at fair value 15 0 15 0  
Other assets, measured at fair value 243 309 243 309  
Nonrecurring | Level 3          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale, measured at fair value 1 0 1 0  
Loans and leases, measured at fair value 420 609 420 609  
Foreclosed properties, measured at fair value 77 83 77 83  
Other assets, measured at fair value $ 5 $ 0 $ 5 $ 0