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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Feb. 28, 2022
Dec. 31, 2021
Sep. 15, 2021
Mar. 19, 2021
Dec. 31, 2020
Business Acquisition [Line Items]            
Goodwill $ 6,039   $ 5,999     $ 4,556
MA            
Business Acquisition [Line Items]            
Goodwill 5,644   5,603     4,245
MIS            
Business Acquisition [Line Items]            
Goodwill $ 395   396     $ 311
Kompany            
Business Acquisition [Line Items]            
Business acquisition interests acquired   100.00%        
RMS            
Business Acquisition [Line Items]            
Business acquisition interests acquired       100.00%    
Goodwill       $ 1,376    
Indemnification asset, amount       95    
Transaction costs     $ 22      
Cash       60    
Accounts receivable       38    
RMS | MA            
Business Acquisition [Line Items]            
Goodwill       1,286    
RMS | MIS            
Business Acquisition [Line Items]            
Goodwill       $ 90    
Cortera            
Business Acquisition [Line Items]            
Business acquisition interests acquired         100.00%  
Goodwill         $ 79  
Cash         4  
Accounts receivable         $ 2