Employee Benefit Plans (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Compensation and Retirement Disclosure [Abstract] | |||
| Cash contributions to defined contribution plans | $ 24 | $ 23 | $ 19 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of the cost recognized during the period for defined contribution plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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