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Newbuildings - Summary Of Newbuildings (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total Newbuildings $ 249 $ 248
Newbuildings [Member]    
Property, Plant and Equipment [Line Items]    
Total Newbuildings $ 249 $ 248