|
Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Carrying Amount | ||
| Financial Instruments | ||
| Long-term debt, excluding current portion | $ 6,459 | $ 6,731 |
| Fair Value | ||
| Financial Instruments | ||
| Long-term debt, excluding current portion | $ 6,938 | $ 7,203 |