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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) | Dec. 31, 2019 rigs
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Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 79
Held-for-sale |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 3
Floaters [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 27
Floaters [Member] | Held-for-sale |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 1
Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 43
Jackups [Member] | Held-for-sale |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 2
Other [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 9
Other [Member] | Held-for-sale |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
ARO |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 7
ARO | Held-for-sale |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
North & South America (Excluding Brazil) [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 18
North & South America (Excluding Brazil) [Member] | Floaters [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 10
North & South America (Excluding Brazil) [Member] | Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 8
North & South America (Excluding Brazil) [Member] | Other [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
North & South America (Excluding Brazil) [Member] | ARO |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
Europe & Mediterranean [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 21
Europe & Mediterranean [Member] | Floaters [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 7
Europe & Mediterranean [Member] | Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 14
Europe & Mediterranean [Member] | Other [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
Europe & Mediterranean [Member] | ARO |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
Middle East & Africa [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 25
Middle East & Africa [Member] | Floaters [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 4
Middle East & Africa [Member] | Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 12
Middle East & Africa [Member] | Other [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 9
Middle East & Africa [Member] | ARO |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 7
Asia Pacific [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 10
Asia Pacific [Member] | Construction in Progress [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 2
Asia Pacific [Member] | Floaters [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 3
Asia Pacific [Member] | Floaters [Member] | Construction in Progress [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 2
Asia Pacific [Member] | Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 7
Asia Pacific [Member] | Jackups [Member] | Construction in Progress [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
Asia Pacific [Member] | Other [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
Asia Pacific [Member] | Other [Member] | Construction in Progress [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
Asia Pacific [Member] | ARO |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0
Asia Pacific [Member] | ARO | Construction in Progress [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 0

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