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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | $ 1,029 | $ 894
Derivative liability, fair value, gross liability | 1,048 | 982
Commodity Future [Member] | Receivable, net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1,009 | 875
Derivative asset, fair value, gross liability | 1,029 | 955
Commodity Swap [Member] | Receivable, net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 6 | 11
Derivative asset, fair value, gross liability | 12 | 11
Commodity Option [Member] | Receivable, net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 11 | 8
Derivative asset, fair value, gross liability | 5 | 3
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 | 2 | 6
Foreign Currency Contracts [Member] | Receivable, net [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1 |
Derivative asset, fair value, gross liability | $ 0 |
Foreign Currency Contracts [Member] | Accrued expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset |  | 0
Derivative liability, fair value, gross liability |  | $ 7

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