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Goodwill (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 item
Goodwill
Number of impaired ultra-deepwater floaters | item		3
Loss on impairment of goodwill	$ 462
Loss on impairment of goodwill per diluted share from continuing operations | $ / shares	$ 1.02
Loss on impairment of goodwill, tax effect	$ 0

X

- Definition

The aggregate amount of write-downs for impairments recognized during the period for goodwill per each share of dilutive common stock from continuing operations.

+ References

No definition available.

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X

- Definition

Represents the tax effect loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill.

+ References

No definition available.

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- Definition

The number of impaired ultra-deepwater floaters.

+ References

No definition available.

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X

- References

No definition available.

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X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267

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