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Acquisitions - Additional Information (Detail)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
board_member
Dec. 31, 2020
USD ($)
board_member
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
board_member
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Goodwill   $ 4,292 $ 4,292   $ 4,292   $ 3,951
Previously held equity interest $ 15            
Nonoperating Income (Expense)              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain     7 $ 0 7 $ 0  
REA Group              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Dilution of interest   0.20%          
Ownership interest after all transactions   61.40%          
Elara              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Cash payments   $ 69          
Acquired finite-lived intangibles   19 19   19    
Goodwill   114 114   114    
Consideration transferred   138          
Fair value of noncontrolling interest   37 $ 37   $ 37    
Fair value of equity interest in acquiree   $ 22          
Increase in equity interest 22.10% 39.00% 39.00%   39.00%    
Number of board of directors | board_member   9 9   9    
Tangible liabilities   $ 5 $ 5   $ 5    
Identifiable intangible assets   29 29   29    
Elara | Trade names              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Indefinite-lived intangible assets   $ 10 $ 10   $ 10    
Elara | REA Group              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Current ownership interest 13.50% 59.70% 59.70%   59.70%    
Number of board seats held | board_member   8 8   8    
Technology | Elara              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Weighted average useful life   5 years          
Avail              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Cash payments   $ 36          
Cash acquired   4 $ 4   $ 4    
Contingent consideration   $ 8          
Certain performance objective period   3 years          
Earn-out liability   $ 4 4   4    
Adjustment holdback   6          
Goodwill   32 32   32    
Avail | Technology              
Schedule Of Business Acquisitions And Divestitures [Line Items]              
Acquired finite-lived intangibles   $ 7 $ 7   $ 7    
Weighted average useful life   5 years