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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, 2022	Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%
British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	16.00%	15.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	63.00%	69.00%
Shell
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	9.00%
ENI
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.00%	7.00%
Floaters | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	43.00%	43.00%
Floaters | Shell
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	67.00%	62.00%
Floaters | ENI
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	42.00%	69.00%
Jackups | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.00%	15.00%
Jackups | Shell
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	33.00%	38.00%
Jackups | ENI
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	58.00%	31.00%

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.

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