|
Significant Accounting Policies (Details 2) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Dec. 31, 2014
|
|
| Significant Accounting Policies | |||
| Research, development and related expenses | $ 463 | $ 452 | |
| Deferred tax assets valuation allowance | $ 22 | $ 22 | |