|
Fair Value Measurements and Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Carrying Value [Member] | ||
| Debt Instrument [Line Items] | ||
| Carrying value of long-term debt | $ 6,110 | $ 6,132 |
| Fair Value, Inputs, Level 2 [Member] | ||
| Debt Instrument [Line Items] | ||
| Estimated fair value of long-term debt | $ 6,463 | $ 6,346 |