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Accounting Policies - Impact of CECL Standard Adoption (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures $ 662   $ 662   $ 318  
Other         0  
Total allowance for credit losses         3,060  
Retained earnings 44,986   44,986   42,215  
Income taxes (benefit) from continuing operations (158) $ 239 (38) $ 451    
Total commercial            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures 548   548   316  
Total consumer            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures $ 114   $ 114   2  
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures         179 $ 179
Other           19
Total allowance for credit losses         700 661
Retained earnings           (671)
Fair Value - Assets         200  
Income taxes (benefit) from continuing operations         200  
Cumulative Effect, Period of Adoption, Adjustment | Total commercial | Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures         53  
Cumulative Effect, Period of Adoption, Adjustment | Total consumer | Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures         126  
Cumulative Effect, Period of Adoption, Adjusted Balance            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures         497 497
Other           19
Total allowance for credit losses           3,721
Retained earnings           $ 41,544
Cumulative Effect, Period of Adoption, Adjusted Balance | Total commercial            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures         369  
Cumulative Effect, Period of Adoption, Adjusted Balance | Total consumer            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Off-balance sheet credit exposures         $ 128