Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 1,522	$ 1,600
MIS
Segment Reporting Information [Line Items]
Revenue	827	1,036
MA
Segment Reporting Information [Line Items]
Revenue	695	564
United States
Segment Reporting Information [Line Items]
Revenue	862	885
United States | MIS
Segment Reporting Information [Line Items]
Revenue	513	647
United States | MA
Segment Reporting Information [Line Items]
Revenue	349	238
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	660	715
Non-U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	314	389
Non-U.S. | MA
Segment Reporting Information [Line Items]
Revenue	346	326
EMEA
Segment Reporting Information [Line Items]
Revenue	434	478
EMEA | MIS
Segment Reporting Information [Line Items]
Revenue	193	248
EMEA | MA
Segment Reporting Information [Line Items]
Revenue	241	230
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	135	156
Asia-Pacific | MIS
Segment Reporting Information [Line Items]
Revenue	74	97
Asia-Pacific | MA
Segment Reporting Information [Line Items]
Revenue	61	59
Americas
Segment Reporting Information [Line Items]
Revenue	91	81
Americas | MIS
Segment Reporting Information [Line Items]
Revenue	47	44
Americas | MA
Segment Reporting Information [Line Items]
Revenue	$ 44	$ 37