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Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Values of Derivative Instruments |  |
Total derivative assets, net | $ 1,058 | $ 1,215
Total derivative liabilities, net | 1,058 | 1,209
Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset |  | 94
Derivative liability, fair value, gross liability |  | 79
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 | 49 | 77
Derivative asset, fair value, gross liability | 53 | 64
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 |  | 15
Derivative asset, fair value, gross liability |  | 13
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 |  | 2
Derivative asset, fair value, gross liability |  | 2
Not Designated as Hedging Instrument [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 1,009 | 1,121
Derivative liability, fair value, gross liability | 1,005 | 1,130
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 | 966 | 1,066
Derivative asset, fair value, gross liability | 942 | 1,073
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 | 16 | 9
Derivative asset, fair value, gross liability | 11 | 6
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 | 2 |
Derivative asset, fair value, gross liability | 1 |
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 5 | 32
Derivative liability, fair value, gross liability | 11 | 46
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 | 4 | 1
Derivative asset, fair value, gross liability | 6 | 4
Not Designated as Hedging Instrument [Member] | Options Held [Member] | Commodity Contract [Member] | Prepaid Expenses and Other Current Assets [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] | Options Held [Member] | Commodity Contract [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset | 0 | 1
Derivative liability, fair value, gross liability | 1 | 0
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 | 5 | 11
Derivative asset, fair value, gross liability | 11 | 0
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | RINs Fixed-Price Contracts [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative asset, fair value, gross asset | 0 |
Derivative asset, fair value, gross liability | 22 |
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 | 10 | 1
Derivative asset, fair value, gross liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Foreign Currency Contract [Member] | Accrued Expenses [Member] |  |
Fair Values of Derivative Instruments |  |
Derivative liability, fair value, gross asset |  | 0
Derivative liability, fair value, gross liability |  | $ 1

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