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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Earnings	$ 19	$ 21	$ (8)	$ 27	$ 36	$ (194)	$ 32	$ (131)
Joint Ventures [Member] | Other Assets [Member]
Investment balance	6						6		$ 9
Joint Ventures [Member] | Investment Income and Other, Net [Member]
Earnings	$ 1			$ 5			$ 3	$ 12

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