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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Eni S.p.A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	4.00%	11.00%	6.00%
British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	14.00%	12.00%	14.00%
Equinor A S A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.00%	6.00%	1.00%	10.00%
Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	81.00%	76.00%	76.00%	70.00%
Floaters
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	53.00%	46.00%	53.00%	42.00%
Floaters | Eni S.p.A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	1.00%	0.00%	5.00%	0.00%
Floaters | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	5.00%	1.00%	5.00%
Floaters | Equinor A S A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.00%	0.00%	1.00%	4.00%
Floaters | Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	49.00%	41.00%	46.00%	33.00%
Jackups
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	37.00%	45.00%	37.00%	48.00%
Jackups | Eni S.p.A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.00%	4.00%	6.00%	6.00%
Jackups | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	3.00%	5.00%	3.00%
Jackups | Equinor A S A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	6.00%	0.00%	6.00%
Jackups | Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	28.00%	32.00%	26.00%	33.00%
Managed Rigs
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.00%	9.00%	10.00%	10.00%
Managed Rigs | Eni S.p.A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	0.00%	0.00%	0.00%
Managed Rigs | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.00%	6.00%	6.00%	6.00%
Managed Rigs | Equinor A S A
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	0.00%	0.00%	0.00%
Managed Rigs | Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.00%	3.00%	4.00%	4.00%

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 275
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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