Revenues - Schedule of Changes in the Deferred Revenue Balances (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	$ 1,673	$ 1,648	$ 1,381	$ 1,333
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(646)	(708)	(907)	(948)
Increases due to amounts billable excluding amounts recognized as revenue during the period	458	508	1,027	1,046
Effect of exchange rate changes	(3)	4	(19)	21
Total changes in deferred revenue	(191)	(196)	101	119
Ending Balance	1,482	1,452	1,482	1,452
Deferred revenue	1,423	1,385	1,423	1,385	$ 1,316
Non-current portion of deferred revenue	59	67	59	67	$ 65
MA
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	1,312	1,288	1,111	1,055
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(529)	(592)	(752)	(788)
Increases due to amounts billable excluding amounts recognized as revenue during the period	365	417	803	830
Effect of exchange rate changes	(2)	3	(16)	19
Total changes in deferred revenue	(166)	(172)	35	61
Ending Balance	1,146	1,116	1,146	1,116
Deferred revenue	1,145	1,115	1,145	1,115
Non-current portion of deferred revenue	1	1	1	1
MIS
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	361	360	270	278
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(117)	(116)	(155)	(160)
Increases due to amounts billable excluding amounts recognized as revenue during the period	93	91	224	216
Effect of exchange rate changes	(1)	1	(3)	2
Total changes in deferred revenue	(25)	(24)	66	58
Ending Balance	336	336	336	336
Deferred revenue	278	270	278	270
Non-current portion of deferred revenue	$ 58	$ 66	$ 58	$ 66