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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Revenue Benchmark [Member] - Customer Concentration Risk	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%
British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.00%	7.00%
Saudi Aramco
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	8.00%	10.00%
Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	16.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	77.00%	67.00%
Floaters | British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	43.00%	12.00%
Floaters | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		89.00%
Jackups | British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.00%	24.00%

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

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