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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Receivable, Net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | $ 6 | $ 0
Derivative asset, fair value, gross liability | 6 | 0
Derivatives Not Designated as Hedging Instruments [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 632 | 2,796
Derivative liability, fair value, gross liability | 733 | 2,687
Derivatives Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Receivable, Net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 628 | 2,792
Derivative asset, fair value, gross liability | 723 | 2,681
Derivatives Not Designated as Hedging Instruments [Member] | Physical Purchase Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 2 | 0
Derivative asset, fair value, gross liability | 4 | 5
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Receivable, Net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 2 | 4
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 | $ 6 | $ 1

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