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Significant Accounting Policies (Condensed) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
Capitalized interest        
Number of newbuilds ceased to capitalize interest | item     2  
Capitalized interest costs on construction work in progress | $ $ 30 $ 40 $ 60 $ 89