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Supplemental Financial Information Schedule of Revenues by Major Customer (Details) - Sales Revenue, Services, Net [Member] - Customer Concentration Risk [Member] | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 100.00% | 100.00%
TOTAL [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 18.00% | 14.00%
Saudi Aramco [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 13.00% | 10.00%
BP [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 5.00% | 12.00%
BP [Member] | Floaters [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage |  | 61.00%
BP [Member] | Jackups Member |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 27.00% |
BP [Member] | Other Rigs [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 73.00% | 10.00%
Petrobras [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 5.00% | 12.00%
Other Customers [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 59.00% | 52.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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