|
Financial Instruments and Derivative Contracts - Net Exposures from Outstanding Derivative Contracts (Detail)
In Millions, unless otherwise specified |
Dec. 31, 2011
USD ($)
|
Dec. 31, 2011
EUR (€)
|
Dec. 31, 2010
USD ($)
|
Dec. 31, 2010
EUR (€)
|
Dec. 31, 2011
Commodity derivative [Member]
Crude oil, refined products and natural gas liquids [Member]
MMBbls
|
Dec. 31, 2010
Commodity derivative [Member]
Crude oil, refined products and natural gas liquids [Member]
MMBbls
|
Dec. 31, 2011
Commodity derivative [Member]
Natural gas and power, Fixed price [Member]
MMcf
|
Dec. 31, 2010
Commodity derivative [Member]
Natural gas and power, Fixed price [Member]
MMcf
|
Dec. 31, 2011
Commodity derivative [Member]
Natural gas and power, Basis [Member]
MMcf
|
Dec. 31, 2010
Commodity derivative [Member]
Natural gas and power, Basis [Member]
MMcf
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|---|---|---|---|---|---|---|---|---|---|---|
| Derivative Instruments [Line Items] | ||||||||||
| Open Position Long (Short) | (13) | (16) | (57,000) | (69,000) | (25,000) | (43,000) | ||||
| Sell U.S. dollar, buy other currencies | $ 1,949 | $ 569 | ||||||||
| Sell euro, buy other currencies | € 61 | € 253 |