Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Interest rate derivatives [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 2
Gross Amounts Offset in the Balance Sheet	0
Amounts of Assets Presented in the Balance Sheet	2
Financial Instruments	0
Cash Collateral Received	0
Cash Collateral Paid	0
Amounts That Would Have Been Presented On Net Basis	2
Commodity Derivatives [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	677	$ 575
Gross Amounts Offset in the Balance Sheet	0	0
Amounts of Assets Presented in the Balance Sheet	677	575
Financial Instruments	(550)	(495)
Cash Collateral Received	(127)	(79)
Cash Collateral Paid	0	0
Amounts That Would Have Been Presented On Net Basis	$ 0	$ 1