Accounts Receivable-Trade, Net - Trade Receivable Balances (Detail) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Contract receivables	[1]	$ 745	$ 823
Retainages		120	146
Accounts receivable-trade, net		832	942
Contract receivables [Member]
Accounts Notes And Loans Receivable [Line Items]
Less allowances		(33)	(27)
Accounts receivable-trade, net		$ 832	$ 942

[1] Retainages classified within Accounts receivable—trade, net are amounts anticipated to be collected within one year and as to which we have an unconditional right to collect from the customer, subject only to the passage of time. Retainages anticipated to be collected beyond one year are classified as Accounts receivable long-term retainages on our Balance Sheet.