Income Taxes (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Decrease In Unrecognized Tax Benefits is Reasonably Possible		$ (115)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		11
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		149
Tax Credit Carryforward, Amount		5
Operating Loss Carryforwards		142
Undistributed Earnings of Foreign Subsidiaries		168
Deferred Tax Assets, Gross [Abstract]
Valuation allowance against tax assets		26	$ 31
Maximum | Forecast
Income Tax Contingency [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	$ (30)
Transition tax on Foreign Earnings [Member]
Income Tax Contingency [Line Items]
Undistributed Earnings of Foreign Subsidiaries		$ 153