Business Combination - Summary of Preliminary Purchase Price Allocation (Parenthetical) (Detail) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
	May 10, 2018		Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Proceeds from asset dispositions				$ 55	$ 55
Goodwill			$ 4,708	4,708
Chicago Bridge & Iron Company N.V. [Member]
Business Acquisition [Line Items]
Proceeds from asset dispositions			52
Business combination, fair value adjustment in unconsolidated affiliates	$ 221
Business combination, fair value adjustment in unconsolidated affiliates amortized investment	118
Accrued provisions for estimated losses on projects	349
Project related intangible assets, net	239
Project related intangible liabilities, net	97
Goodwill	$ 4,708	[1]	4,700	4,700
Goodwill deductible for tax purposes			$ 1,700	$ 1,700
Chicago Bridge & Iron Company N.V. [Member] | Minimum [Member]
Business Acquisition [Line Items]
Business combination, fair value adjustment in unconsolidated affiliates related amortization period	2 years
Business combination, Intangible assets amortized liabilities projects progress	2 years
Chicago Bridge & Iron Company N.V. [Member] | Maximum [Member]
Business Acquisition [Line Items]
Business combination, fair value adjustment in unconsolidated affiliates related amortization period	30 years
Business combination, Intangible assets amortized liabilities projects progress	6 years

[1] Goodwill resulted from the acquired established workforce, which does not qualify for separate recognition, as well as expected future cost savings and revenue synergies associated with the combined operations. Of the $4.7 billion of estimated goodwill recorded in conjunction with the Combination, $1.7 billion is deductible for tax purposes. Given the proximity of the Combination Date to the reporting date of September 30, 2018, the allocation of goodwill for each of our operating groups is in process, and therefore has not been presented.