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Fair Value of Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] $ 90 $ 5
Foreign Currency Contract, Asset, Fair Value Disclosure [2] 0 0
Assets, Fair Value Disclosure 90 5
Foreign Currency Contracts, Liability, Fair Value Disclosure [3] 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 0 0
Foreign Currency Contract, Asset, Fair Value Disclosure [2] 1 19
Assets, Fair Value Disclosure 1 19
Foreign Currency Contracts, Liability, Fair Value Disclosure [3] 2 2
Financial and Nonfinancial Liabilities, Fair Value Disclosure 2 2
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 0 0
Foreign Currency Contract, Asset, Fair Value Disclosure [2] 0 0
Assets, Fair Value Disclosure 0 0
Foreign Currency Contracts, Liability, Fair Value Disclosure [3] 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 90 5
Foreign Currency Contract, Asset, Fair Value Disclosure [2] 1 19
Assets, Fair Value Disclosure 91 24
Foreign Currency Contracts, Liability, Fair Value Disclosure [3] 2 2
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 2 $ 2
[1] Included in Cash and cash equivalents in the Consolidated Balance Sheet.
[2] Included in Other current assets in the Consolidated Balance Sheet.
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