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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