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Revenues - Schedule of Changes in the Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Change in Contract with Customer, Liability [Abstract]      
Beginning Balance $ 1,511 $ 1,381  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (591) (531)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 854 839  
Increases due to acquisitions during the period 15 0  
Effect of exchange rate changes 33 (16)  
Total changes in deferred revenue 311 292  
Ending Balance 1,822 1,673  
Deferred revenue 1,765 1,612 $ 1,454
Non-current portion of deferred revenue 57 61 $ 57
MA      
Change in Contract with Customer, Liability [Abstract]      
Beginning Balance 1,243 1,111  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (492) (437)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 666 652  
Increases due to acquisitions during the period 15 0  
Effect of exchange rate changes 30 (14)  
Total changes in deferred revenue 219 201  
Ending Balance 1,462 1,312  
Deferred revenue 1,461 1,310  
Non-current portion of deferred revenue 1 2  
MIS      
Change in Contract with Customer, Liability [Abstract]      
Beginning Balance 268 270  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (99) (94)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 188 187  
Increases due to acquisitions during the period 0  
Effect of exchange rate changes 3 (2)  
Total changes in deferred revenue 92 91  
Ending Balance 360 361  
Deferred revenue 304 302  
Non-current portion of deferred revenue $ 56 $ 59