|
Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Compensation and Retirement Disclosure [Abstract] | |||
| Cash contributions to defined contribution plans | $ 19 | $ 16 | $ 16 |