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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 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | $ 894 | $ 915
Derivative liability, fair value, gross liability | 982 | 900
Commodity Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 875 | 874
Derivative asset, fair value, gross liability | 955 | 872
Commodity Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 11 | 32
Derivative asset, fair value, gross liability | 11 | 21
Commodity Option [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 8 | 6
Derivative asset, fair value, gross liability | 3 | 2
Physical Purchase Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 0 | 0
Derivative asset, fair value, gross liability | 6 | 5
Foreign Currency Contracts [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset |  | 3
Derivative asset, fair value, gross liability |  | $ 0
Foreign Currency Contracts [Member] | Accrued Liabilities [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 0 |
Derivative liability, fair value, gross liability | $ 7 |

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