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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Financial assets [Abstract]    
Value before application of CME Rule 814 $ 2,434 $ 1,232
Impact of CME Rule 814 (1,983) (993)
Total commodity derivatives 451 239
Total 451 239
Commodity derivatives:    
Value before application of CME Rule 814 2,325 1,200
Impact of CME Rule 814 (1,854) (944)
Total commodity derivatives 471 256
Total 471 256
Net value before application of CME Rule 814 to commodity hedging portfolio 109  
Level 1 [Member]    
Financial assets [Abstract]    
Value before application of CME Rule 814 357 122
Impact of CME Rule 814 (327) (122)
Total commodity derivatives 30 0
Total 30 0
Commodity derivatives:    
Value before application of CME Rule 814 578 199
Impact of CME Rule 814 (546) (199)
Total commodity derivatives 32 0
Total 32 0
Level 2 [Member]    
Financial assets [Abstract]    
Value before application of CME Rule 814 2,076 1,110
Impact of CME Rule 814 (1,656) (871)
Total commodity derivatives 420 239
Total 420 239
Commodity derivatives:    
Value before application of CME Rule 814 1,746 1,001
Impact of CME Rule 814 (1,308) (745)
Total commodity derivatives 438 256
Total 438 256
Level 3 [Member]    
Financial assets [Abstract]    
Value before application of CME Rule 814 1 0
Impact of CME Rule 814 0 0
Total commodity derivatives 1 0
Total 1 0
Commodity derivatives:    
Value before application of CME Rule 814 1 0
Impact of CME Rule 814 0 0
Total commodity derivatives 1 0
Total $ 1 $ 0