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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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	10.00%	9.00%	8.00%
Saudi Aramco
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.00%	16.00%	9.00%	12.00%
Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	15.00%	10.00%	15.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	75.00%	59.00%	72.00%	65.00%
Floaters | British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.00%	17.00%	23.00%	16.00%
Floaters | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	32.00%	90.00%	75.00%	93.00%
Jackups | British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	24.00%	43.00%	21.00%	41.00%

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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.

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