|
Derivative and Financial Instruments - FX Balance Sheet (Details 3) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|
|
Prepaid Expenses and Other Current Assets [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Foreign currency exchange derivative assets | $ 12 | $ 32 |
|
Other Accruals [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Foreign currency exchange derivative liabilities | 5 | 2 |
|
Other liabilities and deferred credits [Member]
|
||
| Derivatives, Fair Value [Line Items] | ||
| Foreign currency exchange derivative liabilities | $ 1 |