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