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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, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | $ 685 | $ 3,133
Derivative liability, fair value, gross liability | 563 | 2,925
Future [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 648 | 3,096
Derivative asset, fair value, gross liability | 522 | 2,886
Swap [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 30 | 34
Derivative asset, fair value, gross liability | 33 | 31
Options Held [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 4 | 2
Derivative asset, fair value, gross liability | 2 | 3
Forward Contracts [Member] | Physical Purchase Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 0 | 1
Derivative asset, fair value, gross liability | 6 | $ 5
Forward Contracts [Member] | Foreign Currency Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 3 |
Derivative asset, fair value, gross liability | $ 0 |

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