Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Nonrecurring Fair Value (Details)

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Fair Value Measurements - Nonrecurring Fair Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale $ 2,942 $ 2,156  
Loans and leases 4,349 5,710  
Other assets 19,739 22,581  
Nonrecurring      
Gains (Losses)      
Loans held-for-sale (18) (6) $ (54)
Loans and leases (202) (336) (458)
Foreclosed properties (24) (41) (41)
Other assets (64) (124) (74)
Loss on loans and leases written down to zero 83 135 $ 150
Nonrecurring | Government Guaranteed Mortgage Loans upon Foreclosure Receivable      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Foreclosed properties 488 801  
Nonrecurring | Level 2      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale 274 0  
Loans and leases 0 0  
Foreclosed properties 0 0  
Other assets 331 425  
Nonrecurring | Level 3      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale 0 2  
Loans and leases 474 894  
Foreclosed properties 42 83  
Other assets $ 14 $ 0