Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized intangibles, Gross Amounts	$ 6,310	$ 6,693
Amortized intangibles, Accumulated Amortization	$ (3,350)	(3,590)
Trade names and trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset, Weighted Average Useful Life	12 years
Amortized intangibles, Gross Amounts	$ 144	140
Amortized intangibles, Accumulated Amortization	$ (109)	(102)
Trade names and trademarks | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Trade names and trademarks | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Customer - related intangibles
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset, Weighted Average Useful Life	21 years
Amortized intangibles, Gross Amounts	$ 3,153	3,145
Amortized intangibles, Accumulated Amortization	$ (1,764)	(1,604)
Customer - related intangibles | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years
Customer - related intangibles | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	25 years
Covenants-not-to-compete
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset, Weighted Average Useful Life	3 years
Amortized intangibles, Gross Amounts	$ 37	39
Amortized intangibles, Accumulated Amortization	$ (36)	(38)
Covenants-not-to-compete | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Covenants-not-to-compete | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Content database
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset, Weighted Average Useful Life	12 years
Amortized intangibles, Gross Amounts	$ 168	167
Amortized intangibles, Accumulated Amortization	$ (40)	(26)
Content database | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Content database | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	16 years
Computer software
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset, Weighted Average Useful Life	5 years
Amortized intangibles, Gross Amounts	$ 2,626	3,029
Amortized intangibles, Accumulated Amortization	$ (1,260)	(1,694)
Computer software | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Computer software | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Patents and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset, Weighted Average Useful Life	6 years
Amortized intangibles, Gross Amounts	$ 182	173
Amortized intangibles, Accumulated Amortization	$ (141)	(126)
Patents and other | Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Patents and other | Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Trade names and trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangibles, Gross Amounts	$ 1,921	$ 1,921