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Fair Value - Schedule of Activity For Energy Commodity and Equity Investments Derivative Assets (Liabilities) Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Level 3 [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance $ 42 $ 36 $ (8)
Transfers in [1]     21
Included in regulatory assets 5 10 (5)
Recognized in net income   $ (4) $ 33
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Purchases and debt conversions 3 $ 3  
Settlements     $ (5)
Other   (3)  
Ending Balance 50 42 36
Equity Investment [Member]      
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 50 54  
Transfer in [1]     21
Recognized in net income   $ (4) $ 33
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Purchases and debt conversions 3 $ 3  
Other   (3)  
Ending Balance 53 50 $ 54
Natural Gas Exchange Agreements [Member]      
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance [2] (8) (18) (8)
Included in regulatory assets [2] 5 10 (5)
Settlements [2]     (5)
Ending Balance [2] $ (3) $ (8) $ (18)
[1] The Company elected to account for certain equity investments at recurring fair value in 2022; as such, the transfer in represents the value as of the date of the election. See further discussion within Note 7.
[2] There were no purchases, issuances or transfers from other categories of derivatives instruments during the periods presented in the table above.