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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Values of Derivative Instruments |  |
Total derivative assets, net | $ 3,249 | $ 1,980
Total derivative liabilities, net | 3,309 | 1,970
Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 111 | 300
Derivative liability, fair value, gross liability | 80 | 286
Designated as Hedging Instrument [Member] | Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 67 | 264
Derivative asset, fair value, gross liability | 40 | 240
Designated as Hedging Instrument [Member] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 0 | 36
Derivative liability, fair value, gross liability | 2 | 46
Designated as Hedging Instrument [Member] | Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 44 |
Derivative asset, fair value, gross liability | 38 |
Not Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 3,138 | 1,680
Derivative liability, fair value, gross liability | 3,229 | 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 | 3,071 | 1,636
Derivative asset, fair value, gross liability | 3,150 | 1,624
Not Designated as Hedging Instrument [Member] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 48 | 38
Derivative liability, fair value, gross liability | 62 | 51
Not Designated as Hedging Instrument [Member] | Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 6 |
Derivative asset, fair value, gross liability | 11 |
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 | 2 | 4
Derivative asset, fair value, gross liability | 1 | 2
Not Designated as Hedging Instrument [Member] | Commodity Option [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 1 | 0
Derivative liability, fair value, gross liability | 1 | 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 | 4 | 2
Derivative asset, fair value, gross liability | 3 | 0
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 3 | 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 | 1 | 3
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 | 3 |
Derivative liability, fair value, gross asset | $ 0 |

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