Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Interest rate derivatives [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		$ 31
Gross Amounts Offset in the Balance Sheet		0
Amounts of Liabilities Presented in the Balance Sheet		31
Financial Instruments		0
Cash Collateral Received		0
Cash Collateral Paid		0
Amounts That Would Have Been Presented On Net Basis		31
Commodity Derivatives [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 384	471
Gross Amounts Offset in the Balance Sheet	0	0
Amounts of Liabilities Presented in the Balance Sheet	384	471
Financial Instruments	(381)	(450)
Cash Collateral Received	(3)	1
Cash Collateral Paid	0	(21)
Amounts That Would Have Been Presented On Net Basis	$ 0	$ 1