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Impairments (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Assets held and used
Impairment of certain corporate assets				$ 52
Deepwater Floater asset group
Assets held and used
Loss associated with impairment				507
Loss associated with impairment, net of tax				$ 481
Loss associated with impairment per diluted share				$ 1.32
Midwater Floater asset group
Assets held and used
Loss associated with impairment				$ 668
Loss associated with impairment, net of tax				$ 654
Loss associated with impairment per diluted share				$ 1.79
Construction in Progress | Deepwater Floater asset group
Assets held and used
Impairment of certain corporate assets				$ 41
Construction in Progress | Midwater Floater asset group
Assets held and used
Impairment of certain corporate assets				11
Rig sales | Assets held for sale
Assets held for sale
Aggregate loss on impairment of assets held for sale	$ 11	$ 13	$ 34	664
Aggregate loss on impairment of assets held for sale, net of tax			$ 31	$ 550
Aggregate loss on impairment of assets per diluted share	$ 0.03	$ 0.03	$ 0.08	$ 1.50

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Represents the loss recognized for an asset classified as held and used in continuing operations.

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Represents the loss recognized for an asset classified as held and used in continuing operations, net of tax.

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The loss recognized for any initial write-down from carrying value to fair value less cost to sell for an asset classified as held for sale in continuing operations.

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Represents the loss recognized for an asset classified as held for sale in continuing operations, net of tax.

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- Definition

Represents the loss from impairment charge to continuing operations on assets held and used per each share of dilutive common stock during the reporting period.

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The loss from impairment charge to continuing operations on assets per each share of dilutive common stock during the reporting period.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51659069&loc=d3e92212-112881

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Impairment
-URI http://asc.fasb.org/extlink&oid=6515133

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

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