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

No definition available.

+ Details

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Namespace Prefix:	rig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- 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=118932676&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.

+ Details

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- Details

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Balance Type:
Period Type:

Drilling Fleet (Impairment held for sale) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets held for sale
Aggregate loss on impairment of assets held for sale			$ 578
Loss associated with impairment, net of tax (per share)			$ 0.94
Aggregate loss on impairment of assets held for sale, tax effect			$ 0
Rig sales
Assets held for sale
Aggregate loss on impairment of assets held for sale	$ 583	$ 999		$ 999	$ 1,400
Loss associated with impairment, net of tax (per share)				$ 2.13	$ 3.59
Aggregate loss on impairment of assets held for sale, tax effect				$ 0	$ 0