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Income Taxes NOL & Tax Credit Carryforwards and Undistributed Foreign Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$ 1,073
Deferred Tax Assets, Tax Credit Carryforwards	64	$ 108
Deferred Tax Assets, Valuation Allowance	1,178	1,008
Undistributed Earnings of Foreign Subsidiaries [Abstract]
Deferred Tax Liabilities, Undistributed Foreign Earnings	59	69
Foreign Tax Authority | Valuation Allowance, Operating Loss Carryforwards
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
Deferred Tax Assets, Valuation Allowance	1,042
Foreign Tax Authority | Valuation Allowance, Tax Credit Carryforward
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 62	$ 49
Foreign Tax Authority | Minimum
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards, Expiration Dates, Period	1 year

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Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]

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