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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Sep. 30, 2017
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	54	[1]
Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	21
Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	33
North & South America (Excl. Brazil)
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	14	[1]
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)	6
Europe & Mediterranean
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	14	[1]
Europe & Mediterranean | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4
Europe & Mediterranean | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10
Middle East & Africa
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	14	[1]
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)	11
Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10	[1]
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)	5
Held-for-sale
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1	[1]
Held-for-sale | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Held-for-sale | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Construction in Progress [Member] | Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1	[1]
Construction in Progress [Member] | Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Construction in Progress [Member] | Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
[1] We provide management services on two rigs owned by third-parties not included in the table above.

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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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