Revenues - Schedule of Changes in the Deferred Revenue Balances (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	$ 1,511	$ 1,381	$ 1,333
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(1,372)	(1,253)	(1,191)
Increases due to amounts billable excluding amounts recognized as revenue during the period	1,502	1,411	1,215
Reclassification to liabilities held-for-sale	(36)
Increases due to acquisitions during the period	15	9
Decreases due to divestiture during the period (2)	(26)
Effect of exchange rate changes	44	(37)	24
Total changes in deferred revenue	127	130	48
Ending Balance	1,638	1,511	1,381
Deferred revenue - current	1,582	1,454	1,316
Deferred revenue - non-current	56	57	65
MA
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	1,243	1,111	1,055
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(1,152)	(1,044)	(980)
Increases due to amounts billable excluding amounts recognized as revenue during the period	1,290	1,200	1,015
Reclassification to liabilities held-for-sale	(36)
Increases due to acquisitions during the period	15	9
Decreases due to divestiture during the period (2)	(26)
Effect of exchange rate changes	34	(33)	21
Total changes in deferred revenue	125	132	56
Ending Balance	1,368	1,243	1,111
Deferred revenue - current	1,366	1,243	1,109
Deferred revenue - non-current	2	0	2
MIS
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	268	270	278
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(220)	(209)	(211)
Increases due to amounts billable excluding amounts recognized as revenue during the period	212	211	200
Reclassification to liabilities held-for-sale	0
Increases due to acquisitions during the period		0
Decreases due to divestiture during the period (2)	0
Effect of exchange rate changes	10	(4)	3
Total changes in deferred revenue	2	(2)	(8)
Ending Balance	270	268	270
Deferred revenue - current	216	211	207
Deferred revenue - non-current	$ 54	$ 57	$ 63