Segment Information - Financial Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	$ 1,522	$ 1,600
Operating, SG&A	788	686
Adjusted Operating Income	734	914
Depreciation and amortization	78	59
Restructuring	0	2
Operating income	656	853
Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	(45)	(42)
Operating, SG&A	(45)	(42)
Adjusted Operating Income	0	0
Depreciation and amortization	0	0
Restructuring	0	0
MIS
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	827	1,036
MIS | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	870	1,076
Operating, SG&A	360	348
Adjusted Operating Income	510	728
Depreciation and amortization	18	18
Restructuring	0	0
MA
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	695	564
MA | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	697	566
Operating, SG&A	473	380
Adjusted Operating Income	224	186
Depreciation and amortization	60	41
Restructuring	$ 0	$ 2