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Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) - Commodity Derivatives [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 471 $ 256
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Liabilities Presented in the Balance Sheet 471 256
Financial Instruments (449) (233)
Cash Collateral Received 0 0
Cash Collateral Paid (15) (17)
Amounts That Would Have Been Presented On Net Basis $ 7 $ 6