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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Benchmark
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	84.00%	89.00%	88.00%	90.00%
Revenue Benchmark | Saudi Aramco
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	16.00%	11.00%	12.00%	10.00%
Revenue Benchmark | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.00%	14.00%	15.00%	14.00%
Revenue Benchmark | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.00%	5.00%	8.00%	7.00%
Revenue Benchmark | INPEX
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.00%	10.00%	7.00%	7.00%
Revenue Benchmark | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	52.00%	60.00%	58.00%	62.00%
Floaters | Revenue Benchmark | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	17.00%		16.00%	33.00%
Floaters | Segment Benchmark | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	90.00%		93.00%
Jackups | Revenue Benchmark | BP
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	43.00%	27.00%	41.00%	18.00%

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- 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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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