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Fair Value of Financial Assets and Liabilities - Recurring (Details) - Significant Other Observable Inputs (Level 2) [Member] - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets:    
Total Assets $ 3 $ 3
Liabilities:    
Foreign derivative contracts 1 1
Total Liabilities 1 1
Foreign Exchange Forward [Member]    
Assets:    
Foreign exchange contracts $ 3 $ 3