Goodwill And Other Acquired Intangible Assets - Acquired Intangible Assets and Related Amortization (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, net	$ 1,784	$ 1,824
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	1,611	1,623
Accumulated amortization	(347)	(313)
Acquired intangible assets, net	1,264	1,310
Software/product technology
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	442	441
Accumulated amortization	(195)	(177)
Acquired intangible assets, net	247	264
Database
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	181	144
Accumulated amortization	(37)	(29)
Acquired intangible assets, net	144	115
Trade names
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	160	161
Accumulated amortization	(42)	(38)
Acquired intangible assets, net	118	123
Other
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, gross	54	55
Accumulated amortization	(43)	(43)
Acquired intangible assets, net	$ 11	$ 12