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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 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | $ 600 | $ 685
Derivative liability, fair value, gross liability | 650 | 563
Commodity Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 562 | 648
Derivative asset, fair value, gross liability | 604 | 522
Commodity Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 23 | 30
Derivative asset, fair value, gross liability | 22 | 33
Commodity Option [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 10 | 4
Derivative asset, fair value, gross liability | 5 | 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 | 19 | 6
Foreign Currency Contracts [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 5 | 3
Derivative asset, fair value, gross liability | $ 0 | $ 0

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