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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Customer Concentration Risk | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue Benchmark |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 84.00% | 89.00% | 88.00% | 90.00%
Revenue Benchmark | Saudi Aramco |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 16.00% | 11.00% | 12.00% | 10.00%
Revenue Benchmark | Total S.A. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 15.00% | 14.00% | 15.00% | 14.00%
Revenue Benchmark | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% | 5.00% | 8.00% | 7.00%
Revenue Benchmark | INPEX |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 7.00% | 10.00% | 7.00% | 7.00%
Revenue Benchmark | Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 52.00% | 60.00% | 58.00% | 62.00%
Floaters | Revenue Benchmark | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 17.00% |  | 16.00% | 33.00%
Floaters | Segment Benchmark | Total S.A. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 90.00% |  | 93.00% |
Jackups | Revenue Benchmark | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 43.00% | 27.00% | 41.00% | 18.00%

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