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Drilling Fleet (Impairment held for sale) (Details) - Rig sales - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Assets held for sale
Aggregate loss on impairment of assets held for sale	$ 433	$ 1,400	$ 981	$ 1,400
Aggregate loss on impairment of assets held for sale, tax effect			$ 0	$ 0
Loss associated with impairment, net of tax (per share)	$ 0.93	$ 3.54	$ 2.15	$ 3.60

X

- Definition

Represents the tax effect of impairments recognized during the period for long-lived assets held in continuing operations for abandonment, exchange or sale.

+ References

No definition available.

+ Details

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X

- Definition

After tax earnings per share or per unit impact arising from asset impairment.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228

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- Definition

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.

+ References

No definition available.

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