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Business Combination - Schedule of Purchase Consideration (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
May 10, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]        
Equity Combination consideration transferred   $ 1,688    
Less: Cash acquired     $ (498)  
Total Combination consideration transferred, net of cash acquired $ 4,100     $ 2,374
Chicago Bridge & Iron Company N.V. [Member]        
Business Acquisition [Line Items]        
CB&I shares for Combination consideration 103      
Business combination, number of McDermott's shares entitled for each share of CB&I owned 85      
McDermott stock price on May 10, 2018 $ 19.92      
Equity Combination consideration transferred $ 1,684      
Fair value of converted awards earned prior to the Combination 9      
Total equity Combination consideration transferred 1,693      
Cash consideration transferred 2,872      
Total Combination consideration transferred 4,565      
Less: Cash acquired (498)      
Total Combination consideration transferred, net of cash acquired $ 4,067