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Employee Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Postemployment Benefits [Abstract] |  |  |
Maximum matching contribution by employer under defined contribution plan | 4.00% |  |
Expense recognized in connection with contributions | $ 43 | $ 36 | $ 27
Deferred compensation plan deferral percentage of basic salary | 100.00% |  |
Deferred compensation plan deferral percentage of bonus | 100.00% |  |

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- Definition Deferred compensation plan deferral percentage of bonus. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- References No definition available. + Details
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