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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]    
Derivative, Gain (Loss) on Derivative, Net $ 25 $ (70)
Derivative, Gain (Loss) on Derivatives, Total Net 121 (13)
Net gains (losses) on derivative contracts [Domain] | Credit Derivatives [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Derivative, Gain (Loss) on Derivative, Net 0 (1)
Net gains (losses) on derivative contracts [Domain] | Interest Rate Swap [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Derivative, Gain (Loss) on Derivative, Net 17 (29)
Net gains (losses) on derivative contracts [Domain] | Futures Contracts [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Derivative, Gain (Loss) on Derivative, Net 8 (40)
Income Loss On Variable Interest Entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Derivative, Gain (Loss) on Derivative, Net 96 57
Income Loss On Variable Interest Entities [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Derivative, Gain (Loss) on Derivative, Net 97 47
Income Loss On Variable Interest Entities [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Derivative, Gain (Loss) on Derivative, Net $ (2) $ 10