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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		$ 108us-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	7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment	91us-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	2us-gaap_ProceedsFromDivestitureOfBusinesses	14us-gaap_ProceedsFromDivestitureOfBusinesses
Shelf Drilling Holdings, Ltd
Summarized results of Discontinued Operations
Number of Drilling Units Sold				38rig_NumberOfDrillingUnitsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember
Proceeds from disposal of assets, net	2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember	3us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember
Maximum financial support	125us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember
Letters of credit issued under committed and uncommitted credit lines	79rig_LettersOfCreditIssuedUnderCommittedAndUncommittedCreditLinesAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember		91rig_LettersOfCreditIssuedUnderCommittedAndUncommittedCreditLinesAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember	113rig_LettersOfCreditIssuedUnderCommittedAndUncommittedCreditLinesAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_ShelfDrillingHoldingsLtdMember
Maximum additional financial support, excluding parent guarantees	65rig_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		11us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember
Aggregate gain (loss) on disposal of assets, tax effect		0rig_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	15rig_DisposalGroupsIncludingDiscontinuedOperationsAmountOutstandingUnderWorkingCapitalLineOfCreditProvidedToBuyer / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember		15rig_DisposalGroupsIncludingDiscontinuedOperationsAmountOutstandingUnderWorkingCapitalLineOfCreditProvidedToBuyer / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_AppliedDrillingTechnologyInternationalLimitedMember
Working capital line of credit to the buyer		15rig_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		1us-gaap_GainLossOnSaleOfOtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_DisposalOfAssetsUnrelatedToRigSalesMember
Aggregate gain (loss) on disposal of assets, tax effect		$ 0rig_GainLossOnDispositionOfAssetsTaxEffect / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rig_DisposalOfAssetsUnrelatedToRigSalesMember

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Amount outstanding under the working capital line of credit provided by the entity to the buyer of discontinued non-strategic operations on completion of the sale transaction.

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Total amount of letters of credit issued under committed and uncommitted credit lines provided by several banks related to the financial support of the disposal group.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Pretax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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