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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Aug. 31, 2021
Business Acquisition [Line Items]            
Gain on disposition   $ 3 $ 8 $ 5 $ 16  
Sale | Office facility in India            
Business Acquisition [Line Items]            
Gain on disposition   3   3    
Gain on disposition after tax   $ 2   2    
Sale | SPIAS            
Business Acquisition [Line Items]            
Gain on disposition     1 2 1  
Gain on disposition after tax     1 $ 2 1  
Sale | IR webhosting business            
Business Acquisition [Line Items]            
Gain on disposition     3   11  
Gain on disposition after tax     2   10  
Sale | East Windsor            
Business Acquisition [Line Items]            
Gain on disposition     4   4  
Gain on disposition after tax     $ 3   $ 3  
IHS Markit            
Business Acquisition [Line Items]            
Shares outstanding (shares)           398,800,000
IHS Markit            
Business Acquisition [Line Items]            
Shares to be received (shares) 0.2838