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Unaudited Condensed Consolidated Financial Statements Unaudited Condensed Consolidated Financial Statements (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Sales Revenue, Net [Member]
Description of the Business [Line Items]
Gain (Loss) on Contract Termination	$ 205,000,000
ENSCO DS-9 [Member] | Sales Revenue, Net [Member]
Description of the Business [Line Items]
Gain (Loss) on Contract Termination	185,000,000
ENSCO 8503 [Member] | Sales Revenue, Net [Member]
Description of the Business [Line Items]
Gain (Loss) on Contract Termination	20,000,000
Atwood Oceanics, Inc. [Member]
Description of the Business [Line Items]
Business Combination, Consideration Transferred	$ 711,000,000
Business Acquisition, Share Price (in dollars per share) | $ / shares	$ 5.32
Atwood Oceanics, Inc. [Member] | Class A ordinary shares, U.S. [Member]
Description of the Business [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares	134,000,000

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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