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Income Taxes (Details 6) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tax Act Enactment [Line Items] |  |  |
Undistributed Earnings of Foreign Subsidiaries | $ 3,600 |  |
Income tax provision | 297 |  |
Tax Credit Carryforward, Valuation Allowance | $ 111 | $ 189 |
U.S. Federal Tax Rate, prior to 2017 Tax Act [Domain] |  |  |
Tax Act Enactment [Line Items] |  |  |
U.S. federal statutory rate (in hundredths) |  | 35.00% |
U.S. Federal Tax Rate, updated for 2017 Tax Act [Domain] |  |  |
Tax Act Enactment [Line Items] |  |  |
U.S. federal statutory rate (in hundredths) | 21.00% | 21.00% |
Limit on deductibility of interest expense |  | 30.00% |
Remeasurement of Deferreds [Domain] |  |  |
Tax Act Enactment [Line Items] |  |  |
Income tax provision | $ 47 |  |
Continuing Operations [Member] |  |  |
Tax Act Enactment [Line Items] |  |  |
U.S. federal statutory rate (in hundredths) | 21.00% | 35.00% | 35.00%
Deferred Tax Liabilities Deemed Repatriation | $ 0 | $ 170 |
Income tax provision | 297 | 934 | $ 327
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 35 | $ 434 |

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