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Derivative Financial Instruments - Additional Information (Details)
 9 Months Ended
Sep. 30, 2021
USD ($)
numberOfCounterparties
Dec. 31, 2020
USD ($)
Derivative [Line Items]    
Number of central counterparties | numberOfCounterparties 2  
Notional value $ 6,200,000,000  
Net derivatives 12,000,000 $ 43,000,000
Estimated accumulated other comprehensive income to be reclassified in next 12 months 19,000,000  
Cash collateral held relative to derivative exposure 0 0
Cash collateral pledged 12,000,000 $ 43,000,000
CHICAGO MERCANTILE EXCHANGE    
Derivative [Line Items]    
Notional value $ 5,900,000,000  
Percent of total notional derivative contracts 94.60%  
Amount of variation margin included as settlement $ (96,000,000)  
London Clearing House    
Derivative [Line Items]    
Notional value $ 300,000,000  
Percent of total notional derivative contracts 5.40%  
Amount of variation margin included as settlement $ 11,000,000