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Revenues - Schedule of Changes in the Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Change in Contract with Customer, Liability [Abstract]          
Beginning Balance $ 1,822 $ 1,673 $ 1,511 $ 1,381  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (685) (646) (1,015) (907)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 451 458 1,044 1,027  
Increases due to acquisitions during the period     15 0  
Effect of exchange rate changes 47 (3) 80 (19)  
Total changes in deferred revenue (187) (191) 124 101  
Ending Balance 1,635 1,482 1,635 1,482  
Deferred revenue 1,578 1,423 1,578 1,423 $ 1,454
Non-current portion of deferred revenue 57 59 57 59 $ 57
MA          
Change in Contract with Customer, Liability [Abstract]          
Beginning Balance 1,462 1,312 1,243 1,111  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (562) (529) (846) (752)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 346 365 804 803  
Increases due to acquisitions during the period     15 0  
Effect of exchange rate changes 39 (2) 69 (16)  
Total changes in deferred revenue (177) (166) 42 35  
Ending Balance 1,285 1,146 1,285 1,146  
Deferred revenue 1,284 1,145 1,284 1,145  
Non-current portion of deferred revenue 1 1 1 1  
MIS          
Change in Contract with Customer, Liability [Abstract]          
Beginning Balance 360 361 268 270  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (123) (117) (169) (155)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 105 93 240 224  
Increases due to acquisitions during the period     0  
Effect of exchange rate changes 8 (1) 11 (3)  
Total changes in deferred revenue (10) (25) 82 66  
Ending Balance 350 336 350 336  
Deferred revenue 294 278 294 278  
Non-current portion of deferred revenue $ 56 $ 58 $ 56 $ 58