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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 | $ 507 rig_LongLivedAssetsHeldAndUsedImpairmentChargeContinuingOperations |
Loss associated with impairment, net of tax | 481 rig_LongLivedAssetsHeldAndUsedImpairmentChargeContinuingOperationsNetOfTax |
Loss associated with impairment per diluted share | $ 1.34 rig_LossOnImpairmentOfAssetHeldAndUsedPerDilutedShareContinuingOperations |
Assets held for sale |  |
Assets held for sale |  |
Aggregate loss on impairment of assets held for sale | 429 rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember | 65 rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember
Aggregate loss on impairment of assets held for sale, net of tax | 393 rig_LongLivedAssetsHeldForSaleImpairmentChargeContinuingOperationsNetOfTax / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember |
Aggregate loss on impairment of assets per diluted share | $ 1.07 rig_LossOnImpairmentOfAssetPerDilutedShareContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember | $ 0.19 rig_LossOnImpairmentOfAssetPerDilutedShareContinuingOperations / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember
Aggregate loss on impairment of assets held for sale, tax effect |  | $ 0 rig_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. + References No definition available. + Details
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- Definition Represents the loss recognized for an asset classified as held and used in continuing operations. + References No definition available. + Details
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- Definition Represents the loss recognized for an asset classified as held and used in continuing operations, net of tax. + References No definition available. + Details
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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. + References No definition available. + Details
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- 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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- 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. + References No definition available. + Details
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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. + References No definition available. + Details
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