Segment Information - Financial Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	$ 1,472	$ 1,275	$ 4,436	$ 4,178
Operating, SG&A	815	778	2,470	2,327
Adjusted Operating Income	657	497	1,966	1,851
Depreciation and amortization	95	83	276	242
Restructuring	27	1	51	32
Operating income	535	413	1,639	1,577
Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	(50)	(45)	(148)	(134)
Operating, SG&A	(50)	(45)	(148)	(134)
Adjusted Operating Income	0	0	0	0
Depreciation and amortization	0	0	0	0
Restructuring	0	0	0	0
MA
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	776	685	2,260	2,055
MA | Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	3	2	10	5
MA | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	779	687	2,270	2,060
Operating, SG&A	517	479	1,584	1,423
Adjusted Operating Income	262	208	686	637
Depreciation and amortization	76	62	220	182
Restructuring	22	1	38	17
MIS
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	696	590	2,176	2,123
MIS | Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	47	43	138	129
MIS | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	743	633	2,314	2,252
Operating, SG&A	348	344	1,034	1,038
Adjusted Operating Income	395	289	1,280	1,214
Depreciation and amortization	19	21	56	60
Restructuring	$ 5	$ 0	$ 13	$ 15