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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Oct. 15, 2018
Aug. 10, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 31, 2018
Business Acquisition [Line Items]            
Amortization expense     $ 103 $ 102 $ 61  
Reis Inc            
Business Acquisition [Line Items]            
Business acquisition interests acquired 100.00%          
Cash paid for business acquisition $ 278          
Acquired cash included in current assets 24          
Account receivables gross included in current assets $ 6          
Omega Performance            
Business Acquisition [Line Items]            
Business acquisition interests acquired           100.00%
Bureau Van Dijk            
Business Acquisition [Line Items]            
Business acquisition interests acquired   100.00%        
Cash paid for business acquisition   $ 3,542        
Acquired cash included in current assets   36        
Account receivables gross included in current assets   88        
Acquired receivables, estimated uncollectible   4        
Acquired deferred revenue   154        
Reduction in revenue included in net income   $ 53   $ 17 36  
Pro forma revenue adjustment for deferred revenue         $ 36