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Unaudited Condensed Consolidated Financial Statements Unaudited Condensed Consolidated Financial Statements (Narrative) (Details) | 6 Months Ended
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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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