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Variable Interest Entities (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
ADDCL
Carrying amounts associated with consolidated variable interest entities
Assets	$ 819	$ 859
Liabilities	31	46
Net carrying amount	$ 788	813
TDSOI
Carrying amounts associated with consolidated variable interest entities
Assets		298
Liabilities		3
Net carrying amount		$ 295

X

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=rig_AngolaDeepwaterDrillingCompanyLimitedMember
Namespace Prefix:
Data Type:	na
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X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=rig_TransoceanDrillingServicesOffshoreIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: