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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Values of Derivative Instruments |  |
Total derivative assets, net |  | $ 537
Total derivative liabilities, net |  | 529
Designated as Hedging Instrument [Member] | Future [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset |  | 25
Derivative asset, fair value, gross liability |  | 36
Not Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1,384 | 512
Derivative liability, fair value, gross liability | 1,253 | 493
Not Designated as Hedging Instrument [Member] | Future [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1,334 | 474
Derivative asset, fair value, gross liability | 1,185 | 455
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 41 | 33
Derivative asset, fair value, gross liability | 49 | 18
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Accrued Liabilities [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 1 | 0
Derivative liability, fair value, gross liability | 1 | 5
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset |  | 3
Derivative asset, fair value, gross liability |  | 0
Not Designated as Hedging Instrument [Member] | Options Held [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 0 | 2
Derivative asset, fair value, gross liability | 1 | 2
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | 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 | 17 | 5
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Foreign Currency Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 8 |
Derivative asset, fair value, gross liability | 0 |
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Foreign Currency Contract [Member] | Accrued Liabilities [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset |  | 0
Derivative liability, fair value, gross liability |  | $ 8

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