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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) | Jun. 30, 2018
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Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 62
Floaters |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 26
Jackups |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 36
North & South America (Excl. Brazil) |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 12
North & South America (Excl. Brazil) | Floaters |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 8
North & South America (Excl. Brazil) | Jackups |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 4
Europe & Mediterranean |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 17
Europe & Mediterranean | Floaters |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 6
Europe & Mediterranean | Jackups |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 11
Middle East & Africa |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 15
Middle East & Africa | Floaters |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 3
Middle East & Africa | Jackups |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 12
Asia & Pacific Rim |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 12
Asia & Pacific Rim | Floaters |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 5
Asia & Pacific Rim | Jackups |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 7
Held-for-sale(2) |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 3
Held-for-sale(2) | Floaters |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 2
Held-for-sale(2) | Jackups |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 1
Construction in Progress [Member] | Asia & Pacific Rim |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 3
Construction in Progress [Member] | Asia & Pacific Rim | Floaters |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 2
Construction in Progress [Member] | Asia & Pacific Rim | Jackups |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs (in rigs) | 1

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