|
Financial Instruments and Derivative Contracts - Fair Value of Derivative Contracts (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
|
Dec. 31, 2010
|
|---|---|---|
|
Prepaid expenses and other current assets [Member]
|
||
| Assets | ||
| Commodity derivative assets | $ 12 | $ 14 |
|
Other assets [Member]
|
||
| Assets | ||
| Commodity derivative assets | 1 | 1 |
|
Other accruals [Member]
|
||
| Liabilities | ||
| Commodity derivative liabilities | 23 | 7 |
|
Other liabilities and deferred credits [Member]
|
||
| Liabilities | ||
| Commodity derivative liabilities | $ 2 |