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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investment [Line Items]    
Cash payment for contingent consideration $ 13  
Contingent consideration liability adjustment 2  
Fair Value, Inputs, Level 3    
Investment [Line Items]    
Fair value of line of credit 26 $ 29
Fair Value | Fair Value, Inputs, Level 2    
Investment [Line Items]    
Value of total debt 22,600 6,000
Carrying value    
Investment [Line Items]    
Value of total debt 21,500 6,000
Fair Value, Recurring | Fair Value, Inputs, Level 3    
Investment [Line Items]    
Contingent consideration $ 1 $ 12