Financial Risk Management Activities - Schedule of Reconciliation for Derivative Activity Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Gain) Loss Reclassified into Income, pre-tax	$ 4	$ 0	$ 6	$ 4
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	3	1	5	3
Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Pre-Tax Balance at Beginning of Period			50	4	$ 4
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), pre-tax			(16)		59
(Gain) Loss Reclassified into Income, pre-tax			(2)		(13)
Pre-Tax Balance at End of Period	32		32		50
After-Tax Balance at Beginning of Period			36	3	3
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax	8	2	(12)	22	42
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	$ (3)	(1)	$ (5)	(9)
After-Tax Balance at End of Period	$ 23		$ 23		$ 36