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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Receivables, Net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | $ 4 | $ 9
Derivative asset, fair value, gross liability | 17 | 20
Derivatives Not Designated as Hedging Instruments [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 412 | 635
Derivative liability, fair value, gross liability | 392 | 661
Derivatives Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Receivables, Net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 399 | 608
Derivative asset, fair value, gross liability | 388 | 648
Derivatives Not Designated as Hedging Instruments [Member] | Physical Purchase Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 13 | 0
Derivative asset, fair value, gross liability | 0 | 3
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Receivables, Net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 0 | 27
Derivative asset, fair value, gross liability | 0 | 0
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 0 | 0
Derivative liability, fair value, gross liability | $ 4 | $ 10

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