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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	May 06, 2014	Dec. 31, 2014
Subsequent events
Aggregate carrying amount of assets held for sale		$ 25us-gaap_AssetsHeldForSaleLongLived
Subsequent Event | Assets held for sale Of Ultra Deepwater Floater GSF Explorer with related equipment | Forecast | Minimum
Subsequent events
Aggregate loss on impairment of assets held for sale, net of tax	100rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperationsNetOfTax / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = rig_AssetsHeldForSaleOfUltraDeepwaterFloaterGSFExplorerWithRelatedEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Aggregate carrying amount of assets held for sale	5us-gaap_AssetsHeldForSaleLongLived / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = rig_AssetsHeldForSaleOfUltraDeepwaterFloaterGSFExplorerWithRelatedEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event | Assets held for sale Of Ultra Deepwater Floater GSF Explorer with related equipment | Forecast | Maximum
Subsequent events
Aggregate loss on impairment of assets held for sale, net of tax	120rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperationsNetOfTax / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = rig_AssetsHeldForSaleOfUltraDeepwaterFloaterGSFExplorerWithRelatedEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Aggregate carrying amount of assets held for sale	$ 20us-gaap_AssetsHeldForSaleLongLived / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = rig_AssetsHeldForSaleOfUltraDeepwaterFloaterGSFExplorerWithRelatedEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

+ Details

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