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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, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | $ 258 | $ 3,133
Derivative liability, fair value, gross liability | 222 | 2,925
Future [Member] | Commodity Contracts [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 234 | 3,096
Derivative asset, fair value, gross liability | 207 | 2,886
Swap [Member] | Commodity Contracts [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 12 | 34
Derivative asset, fair value, gross liability | 12 | 31
Options Held [Member] | Commodity Contracts [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 2 | 2
Derivative asset, fair value, gross liability | 0 | 3
Forward Contracts [Member] | Physical Purchase Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 7 | 1
Derivative asset, fair value, gross liability | 1 | $ 5
Forward Contracts [Member] | 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 |
Forward Contracts [Member] | 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 | $ 2 |

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