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Revenues - Schedule of Changes in the Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Change in Contract with Customer, Liability [Abstract]          
Beginning Balance $ 1,635 $ 1,482 $ 1,511 $ 1,381  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (735) (671) (1,279) (1,147)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 578 502 1,149 1,098  
Reclassification to liabilities held-for-sale (23) 0 (23) 0  
Increases due to acquisitions during the period 0 5 15 5  
Effect of exchange rate changes (28) 41 54 22  
Total changes in deferred revenue (208) (123) (84) (22)  
Ending Balance 1,427 1,359 1,427 1,359  
Deferred revenue 1,369 1,300 1,369 1,300 $ 1,454
Non-current portion of deferred revenue 58 59 58 59 $ 57
MA          
Change in Contract with Customer, Liability [Abstract]          
Beginning Balance 1,285 1,146 1,243 1,111  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (612) (551) (1,074) (950)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 491 410 910 860  
Reclassification to liabilities held-for-sale (23) 0 (23) 0  
Increases due to acquisitions during the period 0 5 15 5  
Effect of exchange rate changes (27) 37 43 21  
Total changes in deferred revenue (171) (99) (129) (64)  
Ending Balance 1,114 1,047 1,114 1,047  
Deferred revenue 1,113 1,047 1,113 1,047  
Non-current portion of deferred revenue 1 0 1 0  
MIS          
Change in Contract with Customer, Liability [Abstract]          
Beginning Balance 350 336 268 270  
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (123) (120) (205) (197)  
Increases due to amounts billable excluding amounts recognized as revenue during the period 87 92 239 238  
Reclassification to liabilities held-for-sale 0 0 0 0  
Increases due to acquisitions during the period 0 0  
Effect of exchange rate changes (1) 4 11 1  
Total changes in deferred revenue (37) (24) 45 42  
Ending Balance 313 312 313 312  
Deferred revenue 256 253 256 253  
Non-current portion of deferred revenue $ 57 $ 59 $ 57 $ 59