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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Assumed combined federal, state, local and foreign effective income tax rate					28.70%				28.70%
Impairment of goodwill	$ 203							$ 197	$ 12
Impairment charge to goodwill at business with ongoing operations								193
Impairment charge to goodwill at business divested prior to current period								4
Reversal of impairment of intangible assets		$ 5
Earnings		27	$ 36	$ (194)	$ 12	$ 53	$ 21	(131)	86
Joint Ventures [Member] | Other Assets [Member]
Investment balance		10						10		$ 6
Joint Ventures [Member] | Investment Income and Other, Net [Member]
Earnings		$ 5			$ 5			$ 12	$ 6
Asset Held For Sale [Member]
Impairment of intangible assets held for sale	$ 5

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