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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financial assets [Abstract]    
Interest rate derivatives $ 26  
Value before application of CME Rule 814 1,336 $ 1,232
Impact of CME Rule 814 (850) (993)
Total commodity derivatives 486 239
Total 512 239
Commodity derivatives:    
Value before application of CME Rule 814 1,213 1,200
Impact of CME Rule 814 (801) (944)
Total commodity derivatives 412 256
Total 412 256
Net value before application of CME Rule 814 to commodity hedging portfolio 123  
Level 1 [Member]    
Financial assets [Abstract]    
Interest rate derivatives 0  
Value before application of CME Rule 814 166 122
Impact of CME Rule 814 (161) (122)
Total commodity derivatives 5 0
Total 5 0
Commodity derivatives:    
Value before application of CME Rule 814 95 199
Impact of CME Rule 814 (90) (199)
Total commodity derivatives 5 0
Total 5 0
Level 2 [Member]    
Financial assets [Abstract]    
Interest rate derivatives 26  
Value before application of CME Rule 814 1,170 1,110
Impact of CME Rule 814 (689) (871)
Total commodity derivatives 481 239
Total 507 239
Commodity derivatives:    
Value before application of CME Rule 814 1,118 1,001
Impact of CME Rule 814 (711) (745)
Total commodity derivatives 407 256
Total 407 256
Level 3 [Member]    
Financial assets [Abstract]    
Interest rate derivatives 0  
Value before application of CME Rule 814 0 0
Impact of CME Rule 814 0 0
Total commodity derivatives 0 0
Total 0 0
Commodity derivatives:    
Value before application of CME Rule 814 0 0
Impact of CME Rule 814 0 0
Total commodity derivatives 0 0
Total $ 0 $ 0