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Impairments (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Assets held and used
Loss associated with impairment	$ 507rig_LongLivedAssetsHeldAndUsedImpairmentChargeContinuingOperations
Loss associated with impairment, net of tax	481rig_LongLivedAssetsHeldAndUsedImpairmentChargeContinuingOperationsNetOfTax
Loss associated with impairment per diluted share	$ 1.34rig_LossOnImpairmentOfAssetHeldAndUsedPerDilutedShareContinuingOperations
Assets held for sale
Assets held for sale
Aggregate loss on impairment of assets held for sale	429rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember	65rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember
Aggregate loss on impairment of assets held for sale, net of tax	393rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperationsNetOfTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember
Aggregate loss on impairment of assets per diluted share	$ 1.07rig_LossOnImpairmentOfAssetPerDilutedShareContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember	$ 0.19rig_LossOnImpairmentOfAssetPerDilutedShareContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember
Aggregate loss on impairment of assets held for sale, tax effect		$ 0rig_ImpairmentOfLongLivedAssetsToBeDisposedOfContinuingOperationsTaxEffect / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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- Definition

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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No definition available.

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- Definition

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

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No definition available.

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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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No definition available.

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- Definition

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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No definition available.

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