Segment Information - Financial Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	$ 1,786	$ 1,470
Operating, SG&A	880	814
Adjusted Operating Income	906	656
Depreciation and amortization	100	88
Restructuring	5	14
Operating income	801	554
Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	(50)	(48)
Operating, SG&A	(50)	(48)
Adjusted Operating Income	0	0
Depreciation and amortization	0	0
Restructuring	0	0
MA
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	799	737
MA | Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	3	3
MA | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	802	740
Operating, SG&A	564	526
Adjusted Operating Income	238	214
Depreciation and amortization	82	70
Restructuring	2	8
MIS
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	987	733
MIS | Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	47	45
MIS | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	1,034	778
Operating, SG&A	366	336
Adjusted Operating Income	668	442
Depreciation and amortization	18	18
Restructuring	$ 3	$ 6