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Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Maximum exposure to loss   $ 2,077 $ 3,457
Carrying value of structured note vehicle   3,684 4,611
Structured note vehicles [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Maximum exposure to loss   1,515 3,003
Loss on structured note settlement $ 39    
Carrying value of structured note vehicle   $ 1,524 $ 3,033
Trading Assets [Member] | Structured note vehicles [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Carrying value of structured note vehicle $ 1,293