Hedging Activities and Fair Value Measurements - Schedule of Asset Balance Sheet Offsetting (Details) - Commodity derivatives - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 476	$ 575
Gross Amounts Offset in the Balance Sheet	0	0
Amounts of Assets Presented in the Balance Sheet	476	575
Financial Instruments	(417)	(495)
Cash Collateral Received	(59)	(79)
Cash Collateral Paid	0	0
Amounts That Would Have Been Presented On Net Basis	$ 0	$ 1