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
		Mar. 31, 2025	Mar. 31, 2024
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		$ 50	$ 42
Included in regulatory assets/liabilities		(9)	1
Recognized in net income		$ (1)	$ 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)
Purchases and debt conversions			$ 1
Settlements		$ (1)
Ending Balance		39	45
Equity Investment [Member]
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		53	50
Recognized in net income		$ (1)	$ 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)
Purchases and debt conversions			$ 1
Ending Balance		$ 52	52
Natural Gas Exchange Agreements [Member]
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	[1]	(3)	(8)
Included in regulatory assets/liabilities	[1]	(9)	1
Settlements	[1]	(1)
Ending Balance	[1]	$ (13)	$ (7)

[1] There were no purchases, issuances or transfers from other categories during the periods presented in the table above.