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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Compensation and Retirement Disclosure [Abstract] | |||
| Cash contributions to defined contribution plans | $ 23us-gaap_DefinedContributionPlanCostRecognized | $ 19us-gaap_DefinedContributionPlanCostRecognized | $ 16us-gaap_DefinedContributionPlanCostRecognized |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- 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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