Business Combination - Summary of Final Purchase Price Allocation of Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - USD ($) $ in Millions			3 Months Ended	6 Months Ended
		May 10, 2018	Sep. 30, 2018	Jun. 30, 2019		Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Proceeds from asset dispositions				$ 83		$ 2
Goodwill				$ 2,704	[1]		$ 2,654
Chicago Bridge & Iron Company N.V. [Member]
Business Acquisition [Line Items]
Proceeds from asset dispositions			$ 52
Business combination, fair value adjustment in unconsolidated affiliates		$ 215
Business combination, fair value adjustment in unconsolidated affiliates amortized investment		146
Accrued provisions for estimated losses on projects		374
Project related intangible assets, net		259
Project related intangible liabilities, net		109
Goodwill	[2]	4,990
Goodwill deductible for tax purposes		1,700
Chicago Bridge & Iron Company N.V. [Member] | NCSA [Member]
Business Acquisition [Line Items]
Goodwill		2,700
Chicago Bridge & Iron Company N.V. [Member] | EARC [Member]
Business Acquisition [Line Items]
Goodwill		461
Chicago Bridge & Iron Company N.V. [Member] | MENA [Member]
Business Acquisition [Line Items]
Goodwill		50
Chicago Bridge & Iron Company N.V. [Member] | APAC [Member]
Business Acquisition [Line Items]
Goodwill		52
Chicago Bridge & Iron Company N.V. [Member] | Technology [Member]
Business Acquisition [Line Items]
Goodwill		$ 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] At June 30, 2019, we had approximately $2.2 billion of cumulative impairment charges recorded in conjunction with our impairment analysis performed during the fourth quarter of 2018, as further described in the 2018 Form 10-K.

[2] 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 approximately $5 billion of goodwill recorded in conjunction with the Combination, approximately $2.7 billion, $461 million, $50 million, $52 million and $1.7 billion, was allocated to our NCSA, EARC, MENA, APAC and Technology reporting segments, respectively. Approximately $1.7 billion of the opening goodwill balance is deductible for tax purposes.