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Commodity Derivatives - Financial Statement Presentation (Details) - Energy Related Derivative - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Liability $ (433)   $ (433)   $ (552)
Derivative Liability, Fair Value, Gross Asset 509   509   554
Derivative Asset 215   215   314
Derivative Liability (326)   (326)   (287)
Gain (Loss) on Derivative Instruments, Net, Pretax 4 $ 15 (143) $ 599  
Gain (Loss) on Derivative Instruments          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gain (Loss) on Derivative Instruments, Net, Pretax 5 24 (133) 645  
Cost of Sales          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gain (Loss) on Derivative Instruments, Net, Pretax (1) (9) (10) (46)  
Not Designated as Hedging Instrument [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset 648   648   866
Derivative Liability, Fair Value, Gross Liability (835)   (835)   (841)
Not Designated as Hedging Instrument [Member] | Gain (Loss) on Derivative Instruments          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized (7) (8) 74 169  
Unrealized 12 32 (207) 476  
Not Designated as Hedging Instrument [Member] | Cost of Sales          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized (2) 0 (7) (3)  
Unrealized 1 $ (9) (3) $ (43)  
Derivative assets [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset 360   360   623
Regulatory assets, deferred charges, and other [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset 288   288   243
Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability (365)   (365)   (496)
Regulatory liabilities, deferred income, and other [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability $ (470)   $ (470)   $ (345)