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Discontinued Operations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Nov. 30, 2012 item
Summarized results of discontinued operations |  |  |  |
Operating revenues |  | $ 108 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |  |
Operating and maintenance expense | (1)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | (104)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense |  |
Gain (loss) on disposal of assets in discontinued operations, net |  | (10)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |
Loss from discontinued operations before income tax expense | (1)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax | (6)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax |  |
Income tax expense | (1)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod | (2)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod |  |
Loss from discontinued operations, net of tax | (2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  |
Summarized results of Discontinued Operations |  |  |  |
Proceeds from disposal of assets, net | 7 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 91 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |
Aggregate gain (loss) on disposal of assets, net | (7)us-gaap_GainLossOnDispositionOfAssets | (3)us-gaap_GainLossOnDispositionOfAssets |  |
Proceeds from disposal of discontinued operations, net | 2 us-gaap_ProceedsFromDivestitureOfBusinesses | 14 us-gaap_ProceedsFromDivestitureOfBusinesses |  |
Shelf Drilling Holdings, Ltd |  |  |  |
Summarized results of Discontinued Operations |  |  |  |
Number of Drilling Units Sold |  |  |  | 38 rig_NumberOfDrillingUnitsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember
Proceeds from disposal of assets, net | 2 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember | 3 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember |  |
Maximum financial support | 125 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember |  |  |
Letters of credit issued under committed and uncommitted credit lines | 79 rig_LettersOfCreditIssuedUnderCommittedAndUncommittedCreditLinesAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember |  | 91 rig_LettersOfCreditIssuedUnderCommittedAndUncommittedCreditLinesAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember | 113 rig_LettersOfCreditIssuedUnderCommittedAndUncommittedCreditLinesAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember
Maximum additional financial support, excluding parent guarantees | 65 rig_GuaranteeObligationsAdditionalMaximumExposure / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember |  |  |
Shelf Drilling Holdings, Ltd | Minimum |  |  |  |
Summarized results of Discontinued Operations |  |  |  |
Period for which Standard Jackups are agreed to be operated under operating agreements | 9 months |  |  |
Shelf Drilling Holdings, Ltd | Maximum |  |  |  |
Summarized results of Discontinued Operations |  |  |  |
Period for which Standard Jackups are agreed to be operated under operating agreements | 27 months |  |  |
ADTI |  |  |  |
Summarized results of discontinued operations |  |  |  |
Gain (loss) on disposal of assets in discontinued operations, net |  | (11)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |  |
Summarized results of Discontinued Operations |  |  |  |
Aggregate loss on sale of assets per diluted share (in dollars per share) |  | $ (0.03)rig_GainLossOnSaleOfAssetsPerDilutedShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |  |
Proceeds from disposal of discontinued operations, net |  | 11 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |  |
Aggregate gain (loss) on disposal of assets, tax effect |  | 0 rig_GainLossOnDispositionOfAssetsTaxEffect / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |  |
Fixed interest percentage on working capital line of credit to buyer | 8.30%rig_DisposalGroupsIncludingDiscontinuedOperationsFixedInterestRateOnWorkingCapitalLineofCreditToBuyer / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |  |  |
Borrowings outstanding under working capital line of credit to buyer | 15 rig_DisposalGroupsIncludingDiscontinuedOperationsAmountOutstandingUnderWorkingCapitalLineOfCreditProvidedToBuyer / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |  | 15 rig_DisposalGroupsIncludingDiscontinuedOperationsAmountOutstandingUnderWorkingCapitalLineOfCreditProvidedToBuyer / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |
Working capital line of credit to the buyer |  | 15 rig_DisposalGroupsIncludingDiscontinuedOperationsWorkingCapitalLineOfCreditProvidedToBuyer / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember |  |
Disposal of assets unrelated to rig sales |  |  |  |
Summarized results of Discontinued Operations |  |  |  |
Recognized aggregate net gain (loss) on disposal of assets unrelated to disposition of rigs |  | 1 us-gaap_GainLossOnSaleOfOtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_DisposalOfAssetsUnrelatedToRigSalesMember |  |
Aggregate gain (loss) on disposal of assets, tax effect |  | $ 0 rig_GainLossOnDispositionOfAssetsTaxEffect / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_DisposalOfAssetsUnrelatedToRigSalesMember |  |

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