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Acquisitions - Additional Information (Details)
$ in Millions
9 Months Ended 12 Months Ended
Jul. 02, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Acquisition
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 2,245 $ 3,356 $ 2,250
Number of business acquisition completed | Acquisition     1    
Foley Trasimene Acquisition Corp          
Business Acquisition [Line Items]          
Consideration transferred $ 4,970        
Business combination, deferred underwriting costs related to initial public offering 36        
Business combination, fees related to PIPE Investment 37        
Business combination, acquisition-related costs 21        
Business combination, seller transaction costs 39        
Business combination, advisory and investment banker fees 36        
Business combination, certain executive compensation related expenses 36        
Goodwill $ 3,356        
Business acquisition, pro forma nonrecurring, direct transaction costs   $ 11