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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Sales Revenue, Services, Net - Customer Concentration Risk	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.00%	13.00%	15.00%	14.00%
Saudi Aramco
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.00%	9.00%	10.00%	9.00%
BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.00%	5.00%	8.00%	8.00%
Petrobras
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.00%	10.00%	5.00%	11.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	65.00%	63.00%	62.00%	58.00%
Floaters | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	90.00%		95.00%
Floaters | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	19.00%		13.00%	43.00%
Jackups | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	44.00%	28.00%	39.00%	15.00%

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