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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Sales Revenue, Services, Net	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.00%	24.00%	14.00%	23.00%
Customer Concentration Risk | Total S.A. [Member] [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	10.00%	10.00%	9.00%
Customer Concentration Risk | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	15.00%	7.00%	15.00%
Customer Concentration Risk | Petrobras
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	11.00%	9.00%	11.00%
Customer Concentration Risk | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	65.00%	40.00%	60.00%	42.00%
Floaters | Customer Concentration Risk | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		78.00%	33.00%	78.00%
Jackups | Customer Concentration Risk | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	27.00%		18.00%
US Gulf Of Mexico | Floaters | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	35.00%	21.00%	36.00%	24.00%
US Gulf Of Mexico | Jackups | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	39.00%	35.00%	38.00%	37.00%

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