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Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017 service contract segments
Segment Reporting Information [Line Items]
Number of operating segments	3
Number of reportable segments	2
Number of services | service	1
Number of contract drilling rigs	62
Number of drilling management contracts | contract	2
Ultra Deepwater Drillships [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	12
Moored Semisubmersible Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	4
Jackup Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	38
Floaters [Member] | Ultra Deepwater Drillships [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	10
Floaters [Member] | Dynamically Positioned Semisubmersible [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	10
Floaters [Member] | Moored Semisubmersible Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	4
Floaters [Member] | Asset under Construction [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	2
Floaters [Member] | Discontinued Operations, Held-for-sale [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	1
Jackups [Member] | Jackup Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	38
Jackups [Member] | Jackup Rigs Deployed [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	37
Jackups [Member] | Asset under Construction [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	1

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- Definition

Number Of Contract Drilling Rig

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- Definition

Number of Drilling Management Contracts

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- Definition

Number of Services

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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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