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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Recognized loss $ 8  
Contingent consideration liabilities 31 $ 46
Paid to seller 23  
(Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration liabilities $ 31 $ 46