XML 59 R50.htm IDEA: XBRL DOCUMENT v3.10.0.1
Business Combination Agreement with Chicago Bridge & Iron Company N.V. ("CB&I") - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 18, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]    
Business combination, ownership percentage 53.00%  
Other operating (income) expenses [Member] | Chicago Bridge & Iron Company N.V. [Member]    
Business Acquisition [Line Items]    
Business combinaton, transaction related cost   $ 9
Term Loan B Facility [Member]    
Business Acquisition [Line Items]    
Senior secured long-term borrowing $ 1,750  
Term Loan C Facility [Member]    
Business Acquisition [Line Items]    
Senior secured long-term borrowing 500  
Letter of Credit Facility [Member]    
Business Acquisition [Line Items]    
Senior secured long-term borrowing 1,200  
Bridge Facility [Member]    
Business Acquisition [Line Items]    
Senior unsecured long-term borrowing 1,500  
Revolving Facility [Member]    
Business Acquisition [Line Items]    
Senior secured long-term borrowing $ 1,000  
Chicago Bridge & Iron Company N.V. [Member]    
Business Acquisition [Line Items]    
Business combination, ownership percentage 47.00%  
Business combination, number of McDermott's shares entitled for each share of CB&I owned | shares 2.47221  
Chicago Bridge & Iron Company N.V. [Member] | Effect of Reverse Stock Split [Member]    
Business Acquisition [Line Items]    
Business combination, number of McDermott's shares entitled for each share of CB&I owned | shares 0.82407  
Reverse stock split three-to-one  
Reverse stock split, conversion ratio 3