Quarterly report pursuant to Section 13 or 15(d)

Derivatives - Gains and Losses on Derivatives Designated as Fair Value Hedges (Details)

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Derivatives - Gains and Losses on Derivatives Designated as Fair Value Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Effect of Fair Value Hedges on Results of Operations [Abstract]        
Derivative $ 174 $ 4,118 $ 10,663 $ 6,043
Hedged Item (304) (4,098) (10,729) (6,032)
Interest rate risk on long-term debt        
Effect of Fair Value Hedges on Results of Operations [Abstract]        
Derivative 475 4,132 10,809 6,045
Hedged Item (600) (4,121) (10,876) (6,050)
Interest rate and foreign currency risk on long-term debt        
Effect of Fair Value Hedges on Results of Operations [Abstract]        
Derivative 60 41 565 98
Hedged Item (60) (32) (551) (80)
Interest rate and foreign currency risk on long-term debt | Interest expense        
Effect of Fair Value Hedges on Results of Operations [Abstract]        
Derivative (3) (3) 731 167
Interest rate and foreign currency risk on long-term debt | Market making and similar activities        
Effect of Fair Value Hedges on Results of Operations [Abstract]        
Derivative 63 30 (178) (89)
Interest rate risk on AFS securities        
Effect of Fair Value Hedges on Results of Operations [Abstract]        
Derivative (361) (55) (711) (100)
Hedged Item 356 55 698 98
Accumulated Other Comprehensive Income (Loss) | Interest rate and foreign currency risk on long-term debt        
Effect of Fair Value Hedges on Results of Operations [Abstract]        
Derivative $ 0 $ 14 $ 12 $ 20