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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Feb. 28, 2021
Business Acquisition [Line Items]        
Gain on disposition   $ 2 $ 7  
SPIAS | Sale        
Business Acquisition [Line Items]        
Gain on disposition   2    
Gain on disposition after tax   $ 2    
IR webhosting business | Sale        
Business Acquisition [Line Items]        
Gain on disposition     7  
Gain on disposition after tax     $ 7  
IHS Markit        
Business Acquisition [Line Items]        
Shares outstanding (shares)       398,500,000
IHS Markit        
Business Acquisition [Line Items]        
Shares to be received (shares) 0.2838