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Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - Commodity Derivatives [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 451 $ 239
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Assets Presented in the Balance Sheet 451 239
Financial Instruments (449) (233)
Cash Collateral Received 0 0
Cash Collateral Paid 0 0
Amounts That Would Have Been Presented On Net Basis $ 2 $ 6