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Goodwill and Other Intangibles (Goodwill) (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) item	Dec. 31, 2018 USD ($) $ / shares
Goodwill and Other Intangibles.
Number of impaired ultra-deepwater floaters | item	3
Loss on impairment of goodwill	$ 462	$ 462
Loss on impairment of goodwill per diluted share from continuing operations | $ / shares		$ 0.99
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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- References

No definition available.

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- 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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

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