Employee Benefit Plans (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Employee Benefit Plans [Abstract] | |||
| Defined Benefit Plan, Contributions by Employer | $ 15 | $ 11 | $ 12 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The increase in the fair value of plan assets from contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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