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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Financial assets [Abstract]    
Interest rate derivatives   $ 26
Value before application of CME Rule 814 $ 794 1,336
Impact of CME Rule 814 (261) (850)
Total commodity derivatives 533 486
Total 533 512
Commodity derivatives:    
Value before application of CME Rule 814 902 1,213
Impact of CME Rule 814 (343) (801)
Total commodity derivatives 559 412
Total 559 412
Net value before application of CME Rule 814 to commodity hedging portfolio (108)  
Level 1 [Member]    
Financial assets [Abstract]    
Interest rate derivatives   0
Value before application of CME Rule 814 391 166
Impact of CME Rule 814 (46) (161)
Total commodity derivatives 345 5
Total 345 5
Commodity derivatives:    
Value before application of CME Rule 814 447 95
Impact of CME Rule 814 (115) (90)
Total commodity derivatives 332 5
Total 332 5
Level 2 [Member]    
Financial assets [Abstract]    
Interest rate derivatives   26
Value before application of CME Rule 814 403 1,170
Impact of CME Rule 814 (215) (689)
Total commodity derivatives 188 481
Total 188 507
Commodity derivatives:    
Value before application of CME Rule 814 455 1,118
Impact of CME Rule 814 (228) (711)
Total commodity derivatives 227 407
Total 227 407
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