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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Woodside Energy [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	12.00%	4.00%	7.00%	4.00%
British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	9.00%	9.00%	8.00%
Saudi Aramco
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.00%	9.00%	9.00%	10.00%
Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	13.00%	11.00%	15.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	63.00%	65.00%	64.00%	63.00%
Floaters | British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	39.00%	19.00%	27.00%	13.00%
Floaters | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	56.00%	90.00%	82.00%	95.00%
Jackups | British Petroleum [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	17.00%	44.00%	20.00%	39.00%

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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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