Debt - Schedule of Uncommitted Bilateral Credit Facilities and Surety Bond Arrangements (Detail) - Uncommitted Bilateral Letter of Credit Facilities and Surety Bond Arrangements [Member] - USD ($)		Mar. 31, 2019	Dec. 31, 2018
Bank Guarantee and Bilateral Letter of Credit [Member]
Debt Instrument [Line Items]
Available capacity under current credit agreement	[1]	$ 1,668,000,000	$ 1,669,000,000
Letters of credit utilized	[1]	1,095,000,000	1,060,000,000
Surety Bonds [Member]
Debt Instrument [Line Items]
Available capacity under current credit agreement	[2]	840,000,000	842,000,000
Letters of credit utilized	[2]	$ 532,000,000	$ 475,000,000

[1] ^{Approximately $175 million of this capacity is available only upon provision of an equivalent amount of cash collateral.}

[2] ^{Excludes approximately $360 million of surety bonds maintained on behalf of CB&I’s former Capital Services Operations, which were sold to CSVC Acquisition Corp (“CSVC”) in June 2017. We also continue to maintain guarantees on behalf of CB&I’s former Capital Services Operations business in support of approximately $45 million of RPOs. We are entitled to an indemnity from CSVC for both the surety bonds and guarantees.}