Financial Instrucments Fair Value by Balance Sheet Location (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010 |
|---|---|---|
Foreign Currency Exchange Contracts [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Derivatives Fair Value By Balance Sheet Location [Line Items] | ||
| Derivative Asset, Fair Value, Net | $ 16 | $ 16 |
| Derivative Liability, Fair Value, Net | 40 | 14 |
Available for sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Derivatives Fair Value By Balance Sheet Location [Line Items] | ||
| Derivative Asset, Fair Value, Net | 332 | 322 |
Interest Rate Swap Agreements [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Derivatives Fair Value By Balance Sheet Location [Line Items] | ||
| Derivative Asset, Fair Value, Net | 135 | 22 |
Commodity Contracts [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Derivatives Fair Value By Balance Sheet Location [Line Items] | ||
| Derivative Asset, Fair Value, Net | 1 | 2 |
| Derivative Liability, Fair Value, Net | $ 3 | $ 2 |