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Segment Information - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disclosure of reclassifications or changes in presentation [line items]          
Reduction in revenue [1] $ (32,504) $ (60,029) $ (90,544) $ (92,533) $ (174,278)
Contracts classified as held for trading reported net          
Disclosure of reclassifications or changes in presentation [line items]          
Reduction in revenue $ 8,028 $ 16,313      
[1]
See Note 2 “Segment information”.