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Condensed Consolidating Financial Information (Details 3) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Mar. 18, 2015
Mar. 19, 2014
Mar. 31, 2015
Mar. 31, 2014
Condensed Consolidating Financial Information        
Cash flows from operating activities     $ 526us-gaap_NetCashProvidedByUsedInOperatingActivities $ 136us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities        
Capital expenditures     (201)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,131)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from disposal of assets, net     7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 91us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from disposal of assets in discontinued operations, net     2us-gaap_ProceedsFromDivestitureOfBusinesses 14us-gaap_ProceedsFromDivestitureOfBusinesses
Other, net       (12)rig_PaymentsForProceedsFromOtherInvestingActivities1
Net cash used in investing activities     (192)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,038)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities        
Repayments of debt     (63)us-gaap_RepaymentsOfLongTermDebt (237)us-gaap_RepaymentsOfLongTermDebt
Proceeds from restricted cash investments     57us-gaap_ProceedsFromSaleOfRestrictedInvestments 107us-gaap_ProceedsFromSaleOfRestrictedInvestments
Deposits to restricted cash investments       (20)us-gaap_PaymentsToAcquireRestrictedInvestments
Distribution of qualifying additional paid-in capital (272)us-gaap_PaymentsOfCapitalDistribution (202)us-gaap_PaymentsOfCapitalDistribution (272)us-gaap_PaymentsOfCapitalDistribution (202)us-gaap_PaymentsOfCapitalDistribution
Distribution to holders of noncontrolling interest     (7)us-gaap_PaymentsOfDividendsMinorityInterest  
Other, net     (2)rig_OtherFinancingActivities (2)rig_OtherFinancingActivities
Net cash used in financing activities     (287)us-gaap_NetCashProvidedByUsedInFinancingActivities (354)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents     47us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,256)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period     2,635us-gaap_CashAndCashEquivalentsAtCarryingValue 3,243us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period     2,682us-gaap_CashAndCashEquivalentsAtCarryingValue 1,987us-gaap_CashAndCashEquivalentsAtCarryingValue
Reportable Entity | Parent Guarantor        
Condensed Consolidating Financial Information        
Cash flows from operating activities     2us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
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10us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Cash flows from financing activities        
Distribution of qualifying additional paid-in capital     (272)us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
(202)us-gaap_PaymentsOfCapitalDistribution
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= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Financing activities with affiliates, net     275rig_FinancingActivitiesWithAffiliatesNet
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= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
217rig_FinancingActivitiesWithAffiliatesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Other, net     (2)rig_OtherFinancingActivities
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
(2)rig_OtherFinancingActivities
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/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Net cash used in financing activities     1us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
13us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Net increase (decrease) in cash and cash equivalents     3us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
23us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Cash and cash equivalents at beginning of period     16us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Cash and cash equivalents at end of period     19us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
27us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= rig_ParentCompanyGuarantorMember
Reportable Entity | Subsidiary Issuer        
Condensed Consolidating Financial Information        
Cash flows from operating activities     (75)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
(128)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Cash flows from investing activities        
Investing activities with affiliates, net     (353)rig_InvestmentActivitiesWithAffiliatesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
(737)rig_InvestmentActivitiesWithAffiliatesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Net cash used in investing activities     (353)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
(737)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Cash flows from financing activities        
Financing activities with affiliates, net     746rig_FinancingActivitiesWithAffiliatesNet
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= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
(42)rig_FinancingActivitiesWithAffiliatesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Net cash used in financing activities     746us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
(42)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Net increase (decrease) in cash and cash equivalents     318us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
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(907)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Cash and cash equivalents at beginning of period     842us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
1,617us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Cash and cash equivalents at end of period     1,160us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
710us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Reportable Entity | Other Subsidiaries        
Condensed Consolidating Financial Information        
Cash flows from operating activities     599us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
254us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash flows from investing activities        
Capital expenditures     (201)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(1,131)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from disposal of assets, net     7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
91us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from disposal of assets in discontinued operations, net     2us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
14us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Investing activities with affiliates, net     (746)rig_InvestmentActivitiesWithAffiliatesNet
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= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
62rig_InvestmentActivitiesWithAffiliatesNet
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/ dei_LegalEntityAxis
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Other, net       (12)rig_PaymentsForProceedsFromOtherInvestingActivities1
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash used in investing activities     (938)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(976)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash flows from financing activities        
Repayments of debt     (63)us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(237)us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from restricted cash investments     57us-gaap_ProceedsFromSaleOfRestrictedInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
107us-gaap_ProceedsFromSaleOfRestrictedInvestments
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Deposits to restricted cash investments       (20)us-gaap_PaymentsToAcquireRestrictedInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Financing activities with affiliates, net     78rig_FinancingActivitiesWithAffiliatesNet
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/ dei_LegalEntityAxis
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500rig_FinancingActivitiesWithAffiliatesNet
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/ dei_LegalEntityAxis
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Distribution to holders of noncontrolling interest     (7)us-gaap_PaymentsOfDividendsMinorityInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net cash used in financing activities     65us-gaap_NetCashProvidedByUsedInFinancingActivities
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
350us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net increase (decrease) in cash and cash equivalents     (274)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
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(372)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents at beginning of period     1,777us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,622us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents at end of period     1,503us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,250us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
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Consolidating adjustments        
Cash flows from investing activities        
Investing activities with affiliates, net     1,099rig_InvestmentActivitiesWithAffiliatesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
675rig_InvestmentActivitiesWithAffiliatesNet
/ us-gaap_ConsolidationItemsAxis
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Net cash used in investing activities     1,099us-gaap_NetCashProvidedByUsedInInvestingActivities
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675us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_ConsolidationItemsAxis
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Cash flows from financing activities        
Financing activities with affiliates, net     (1,099)rig_FinancingActivitiesWithAffiliatesNet
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(675)rig_FinancingActivitiesWithAffiliatesNet
/ us-gaap_ConsolidationItemsAxis
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Net cash used in financing activities     $ (1,099)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_ConsolidationItemsAxis
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$ (675)us-gaap_NetCashProvidedByUsedInFinancingActivities
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