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Risk Management - Effect of Derivative Contracts on the Income Statement (Details) - Derivatives designated as hedging instruments - Derivatives in fair value hedging relationships - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Interest rate contracts | Interest, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives adjustments on commodity sales $ (317) $ (217)
Hedged fixed rate debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative amount of fair value hedging adjustments to hedged fixed rate debt 56  
Hedged fixed rate debt | Interest, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives adjustments on commodity sales $ 320 $ 219