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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Jun. 30, 2018
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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Total Number Of Contract Drilling Rigs

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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.

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