Financial Risk Management Activities - Schedule of Reconciliation for Derivative Activity Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Gain) Loss Reclassified into Income, pre-tax	$ (1)	$ 338	$ 3	$ 365
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax	32	59	35	77
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	243	2	260
Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Pre-Tax Balance at Beginning of Period			4	(4)	$ (4)
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), pre-tax			24		13
(Gain) Loss Reclassified into Income, pre-tax			(11)		(5)
Pre-Tax Balance at End of Period	17		17		4
After-Tax Balance at Beginning of Period			3	(3)	(3)
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax	(5)	13	17	23	9
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	$ (2)	(8)	$ (2)	(3)
After-Tax Balance at End of Period	$ 12		$ 12		$ 3