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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Values of Derivative Instruments |  |
Total derivative assets, net | $ 2,274 | $ 1,980
Total derivative liabilities, net | 2,349 | 1,970
Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 254 | 300
Derivative liability, fair value, gross liability | 274 | 286
Designated as Hedging Instrument [Member] | Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 161 | 264
Derivative liability, fair value, gross asset | 188 | 240
Designated as Hedging Instrument [Member] | Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 89 |
Derivative liability, fair value, gross asset | 83 |
Designated as Hedging Instrument [Member] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross liability | 4 | 36
Derivative liability, fair value, gross liability | 3 | 46
Not Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 2,020 | 1,680
Derivative liability, fair value, gross liability | 2,075 | 1,684
Not Designated as Hedging Instrument [Member] | Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1,949 | 1,636
Derivative liability, fair value, gross asset | 1,957 | 1,624
Not Designated as Hedging Instrument [Member] | Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 46 |
Derivative liability, fair value, gross asset | 48 |
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 | 1 | 4
Derivative liability, fair value, gross asset | 0 | 2
Not Designated as Hedging Instrument [Member] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross liability | 22 | 38
Derivative liability, fair value, gross liability | 31 | 51
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 liability, fair value, gross asset | 0 | 0
Not Designated as Hedging Instrument [Member] | Commodity Option [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross liability |  | 0
Derivative liability, fair value, gross liability |  | 2
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross liability | 0 | 0
Derivative liability, fair value, gross liability | 36 | 2
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1 |
Derivative liability, fair value, gross asset | 0 |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross liability | 0 | 0
Derivative liability, fair value, gross liability | $ 3 | $ 3

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