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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Values of Derivative Instruments |  |
Total derivatives assets, net | $ 1,215 | $ 1,980
Total derivative liabilities, net | 1,209 | 1,970
Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 94 | 300
Derivative liability, fair value, gross liability | 79 | 286
Designated as Hedging Instrument [Member] | Future [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 77 | 264
Derivative asset, fair value, gross liability | 64 | 240
Designated as Hedging Instrument [Member] | Swap [Member] | Trade Accounts Receivable [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 15 |
Derivative asset, fair value, gross liability | 13 |
Designated as Hedging Instrument [Member] | Swap [Member] | Prepaid Expenses And Other [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 2 |
Derivative asset, fair value, gross liability | 2 |
Designated as Hedging Instrument [Member] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset |  | 36
Derivative liability, fair value, gross liability |  | 46
Not Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1,121 | 1,680
Derivative liability, fair value, gross liability | 1,130 | 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 | 1,066 | 1,636
Derivative asset, fair value, gross liability | 1,073 | 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 | 9 |
Derivative asset, fair value, gross liability | 6 |
Not Designated as Hedging Instrument [Member] | Swap [Member] | Prepaid Expenses And Other [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] | Swap [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 32 | 38
Derivative liability, fair value, gross liability | 46 | 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 asset, fair value, gross liability | 4 | 0
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 | 0 | 2
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Inventories [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 11 | 0
Derivative asset, fair value, gross liability | 0 | 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 asset, fair value, gross liability | 0 |
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

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