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Supplemental Financial Information Schedule of Revenues by Major Customer (Details) - Sales Revenue, Services, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
TOTAL [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	18.00%	14.00%
Saudi Aramco [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	13.00%	10.00%
BP [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	5.00%	12.00%
BP [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		61.00%
BP [Member] | Jackups Member
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	27.00%
BP [Member] | Other Rigs [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	73.00%	10.00%
Petrobras [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	5.00%	12.00%
Other Customers [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	59.00%	52.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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No definition available.

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