Summary of Amounts Due to and Due from Related Party (Detail) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Related Party Transactions [Abstract]
Related party receivables	[1]	$ 1	$ 2
Related party payables	[2]	18	27
Related party accrued expenses	[3]	$ 9	$ 10

[1] Included in Receivables, net in the Condensed Consolidated Balance Sheet.

[2] Included in Accounts payable in the Condensed Consolidated Balance Sheet.

[3] Included in Accrued expenses in the Condensed Consolidated Balance Sheet.