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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Income Tax And Effective Tax Rate [Abstract] |  |
Income tax provision | $ 76 | $ 67
Effective tax rate | 15.00% | 19.40%
Tax Year 2017 [Member] |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |
Tax Year 2018 [Domain] |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |
Income Tax And Effective Tax Rate [Abstract] |  |
Limit on deductibility of interest expense | 30.00% |
Remeasurement of Deferreds [Member] |  |
Income Tax And Effective Tax Rate [Abstract] |  |
Income tax provision | $ 16 |

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