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, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investment, pre-tax impairment charge $ 2,072 $ 0 $ 0
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale 3,709 2,942  
Loans and leases 8,335 4,349  
Other assets 15,518 19,739  
Nonrecurring      
Gains (Losses)      
Loans held-for-sale (14) (18) (6)
Loans and leases (81) (202) (336)
Foreclosed properties (9) (24) (41)
Other assets (2,145) (64) (124)
Loss on loans and leases written down to zero 36 83 $ 135
Nonrecurring | Government Guaranteed Mortgage Loans upon Foreclosure Receivable      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Foreclosed properties 260 488  
Nonrecurring | Level 2      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale 53 274  
Loans and leases 0 0  
Foreclosed properties 0 0  
Other assets 178 331  
Nonrecurring | Level 3      
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis      
Loans held-for-sale 102 0  
Loans and leases 257 474  
Foreclosed properties 17 42  
Other assets 646 $ 14  
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