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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%

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