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Commodity Derivatives - Financial Statement Presentation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Derivative assets   Derivative assets   Derivative assets
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Current   Derivative Liability, Current   Derivative Liability, Current
Energy Related Derivative          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Liability $ (334)   $ (334)   $ (382)
Derivative Liability, Fair Value, Gross Asset 545   545   670
Derivative Asset 231   231   344
Derivative Liability (308)   (308)   (400)
Gain (Loss) on Derivative Instruments, Net, Pretax 58 $ 4 32 $ (143)  
Energy Related Derivative | Gain (Loss) on Derivative Instruments          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gain (Loss) on Derivative Instruments, Net, Pretax 56 5 30 (133)  
Energy Related Derivative | Cost of Sales          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gain (Loss) on Derivative Instruments, Net, Pretax 2 (1) 2 (10)  
Not Designated as Hedging Instrument [Member] | Energy Related Derivative          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset 565   565   726
Derivative Liability, Fair Value, Gross Liability (853)   (853)   (1,070)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Gain (Loss) on Derivative Instruments          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized 7 (7) (21) 74  
Unrealized 49 12 51 (207)  
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Cost of Sales          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized 0 (2) (2) (7)  
Unrealized 2 $ 1 4 $ (3)  
Derivative assets [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset 384   384   508
Regulatory assets, deferred charges, and other [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset 181   181   218
Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability (480)   (480)   (635)
Regulatory liabilities, deferred income, and other [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability $ (373)   $ (373)   $ (435)