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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Values of Derivative Instruments |  |
Total derivative assets, net | $ 2,945 | $ 1,980
Total derivative liabilities, net | 2,770 | 1,970
Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 132 | 300
Derivative liability, fair value, gross liability | 130 | 286
Designated as Hedging Instrument [Member] | Future [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 2 |
Derivative liability, fair value, gross liability | 1 |
Designated as Hedging Instrument [Member] | Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 95 | 264
Derivative asset, fair value, gross liability | 95 | 240
Designated as Hedging Instrument [Member] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 31 | 36
Derivative liability, fair value, gross liability | 32 | 46
Designated as Hedging Instrument [Member] | Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 4 |
Derivative asset, fair value, gross liability | 2 |
Not Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 2,813 | 1,680
Derivative liability, fair value, gross liability | 2,640 | 1,684
Not Designated as Hedging Instrument [Member] | Future [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 1,217 |
Derivative liability, fair value, gross liability | 1,141 |
Not Designated as Hedging Instrument [Member] | Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1,470 | 1,636
Derivative asset, fair value, gross liability | 1,385 | 1,624
Not Designated as Hedging Instrument [Member] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 13 | 38
Derivative liability, fair value, gross liability | 20 | 51
Not Designated as Hedging Instrument [Member] | Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 45 |
Derivative asset, fair value, gross liability | 46 |
Not Designated as Hedging Instrument [Member] | Swap [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 49 | 4
Derivative asset, fair value, gross liability | 42 | 2
Not Designated as Hedging Instrument [Member] | Commodity Option [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset |  | 0
Derivative liability, fair value, gross liability |  | 2
Not Designated as Hedging Instrument [Member] | Commodity Option [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1 | 2
Derivative asset, fair value, gross liability | 1 | 0
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 18 | 0
Derivative asset, fair value, gross liability | 0 | 2
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 0 | 0
Derivative liability, fair value, gross liability | $ 5 | $ 3

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