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Supplemental Financial Information Supplemental Financial Information (Major Customers) (Details) - Customer Concentration Risk [Member] - Revenue	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
TOTAL [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	8.00%	16.00%	15.00%
Saudi Aramco [Member] [Domain]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	9.00%	7.00%	11.00%
BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	11.00%	9.00%	7.00%
Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	72.00%	68.00%	67.00%
Floaters [Member] | TOTAL [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	71.00%	93.00%
Floaters [Member] | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	30.00%	16.00%	27.00%
Other Rigs [Member] | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	51.00%	43.00%	53.00%
Jackups Member | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	19.00%	41.00%	20.00%

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
-Publisher FASB
-Name Accounting Standards Codification
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