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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Sales Revenue, Services, Net - Customer Concentration Risk | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Total S.A. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 13.00% | 13.00% | 15.00% | 14.00%
Saudi Aramco |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 9.00% | 9.00% | 10.00% | 9.00%
BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 9.00% | 5.00% | 8.00% | 8.00%
Petrobras |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 4.00% | 10.00% | 5.00% | 11.00%
Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 65.00% | 63.00% | 62.00% | 58.00%
Floaters | Total S.A. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 90.00% |  | 95.00% |
Floaters | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 19.00% |  | 13.00% | 43.00%
Jackups | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 44.00% | 28.00% | 39.00% | 15.00%

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