Revenues - Schedule of Changes in the Deferred Revenue Balances (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	$ 1,366	$ 1,235	$ 1,335	$ 1,187
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(590)	(602)	(1,069)	(1,014)
Increases due to amounts billable excluding amounts recognized as revenue during the period	471	478	1,037	937
Increases due to acquisitions during the period	0	89	1	93
Effect of exchange rate changes	(14)	(14)	(71)	(17)
Total changes in deferred revenue	(133)	(49)	(102)	(1)
Ending Balance	1,233	1,186	1,233	1,186
Deferred revenue - current	1,155	1,099	1,155	1,099	$ 1,249
Deferred revenue - non-current	78	87	78	87	$ 86
MIS
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	347	368	296	313
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(110)	(118)	(186)	(200)
Increases due to amounts billable excluding amounts recognized as revenue during the period	82	85	218	224
Increases due to acquisitions during the period	0	0	0	0
Effect of exchange rate changes	(5)	(2)	(14)	(4)
Total changes in deferred revenue	(33)	(35)	18	20
Ending Balance	314	333	314	333
Deferred revenue - current	238	247	238	247
Deferred revenue - non-current	76	86	76	86
MA
Change in Contract with Customer, Liability [Abstract]
Beginning Balance	1,019	867	1,039	874
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(480)	(484)	(883)	(814)
Increases due to amounts billable excluding amounts recognized as revenue during the period	389	393	819	713
Increases due to acquisitions during the period	0	89	1	93
Effect of exchange rate changes	(9)	(12)	(57)	(13)
Total changes in deferred revenue	(100)	(14)	(120)	(21)
Ending Balance	919	853	919	853
Deferred revenue - current	917	852	917	852
Deferred revenue - non-current	$ 2	$ 1	$ 2	$ 1