Financial Instruments Gains Losses Recognized in OCI (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
Foreign Currency Exchange Contracts [Member] | ||||
| Gains Losses Recognized In Oci [Line Items] | ||||
| Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | $ (30) | $ 8 | $ (14) | $ 16 |
Commodity Contracts [Member] | ||||
| Gains Losses Recognized In Oci [Line Items] | ||||
| Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net | $ (3) | $ (3) | $ (1) | $ (6) |