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Fair Value Measurements - Assets and Liabilities Measured at Fair Value On a Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash flow hedges $ 4 $ 0
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration $ 12 $ 12