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Fair Value - Schedule of Activity for Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Level 3 [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 34 $ 42 $ 50 $ 42
Included in regulatory assets/liabilities 1 1 (10) 1
Recognized in net income   $ 2 $ (4) $ 1
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) Other Nonoperating Income (Expense)
Purchases and debt conversions   $ 1   $ 2
Settlements     $ (1)  
Ending Balance 35 46 35 46
Equity Investment [Member]        
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 49 50 53 50
Recognized in net income   $ 2 $ (4) $ 1
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) Other Nonoperating Income (Expense)
Purchases and debt conversions   $ 1   $ 2
Ending Balance 49 53 $ 49 53
Natural Gas Exchange Agreements [Member]        
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance [1] (15) (8) (3) (8)
Included in regulatory assets/liabilities [1] 1 1 (10) 1
Settlements [1]     (1)  
Ending Balance [1] $ (14) $ (7) $ (14) $ (7)
[1] There were no purchases, issuances or transfers from other categories during the periods presented in the table above.