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Financial Instruments (Details)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Eksportfinans Loans due January 2018 USD ($)	Mar. 31, 2015 Eksportfinans Loans due January 2018 NOK	Dec. 31, 2014 Eksportfinans Loans due January 2018 USD ($)	Dec. 31, 2014 Eksportfinans Loans due January 2018 NOK	Mar. 31, 2015 Carrying amount USD ($)	Dec. 31, 2014 Carrying amount USD ($)	Mar. 31, 2015 Carrying amount Other assets USD ($)	Dec. 31, 2014 Carrying amount Other assets USD ($)	Mar. 31, 2015 Carrying amount Eksportfinans Loans due January 2018 USD ($)	Dec. 31, 2014 Carrying amount Eksportfinans Loans due January 2018 USD ($)	Mar. 31, 2015 Carrying amount Certain contingent obligations USD ($)	Dec. 31, 2014 Carrying amount Certain contingent obligations USD ($)	Mar. 31, 2015 Fair value USD ($)	Dec. 31, 2014 Fair value USD ($)	Mar. 31, 2015 Fair value Significant other observable inputs USD ($)	Dec. 31, 2014 Fair value Significant other observable inputs USD ($)	Mar. 31, 2015 Fair value Significant other observable inputs Eksportfinans Loans due January 2018 USD ($)	Dec. 31, 2014 Fair value Significant other observable inputs Eksportfinans Loans due January 2018 USD ($)
Financial instruments
Cash and cash equivalents							$ 2,682,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	$ 2,635,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember							$ 2,682,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	$ 2,635,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Notes and other loans receivable							15,000,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	15,000,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	15,000,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	15,000,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember					15,000,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	15,000,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Restricted cash investments			290,000,000us-gaap_RestrictedInvestments / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member	2,300,000,000us-gaap_RestrictedInvestments / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member	370,000,000us-gaap_RestrictedInvestments / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member	2,800,000,000us-gaap_RestrictedInvestments / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member									309,000,000us-gaap_RestrictedInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	394,000,000us-gaap_RestrictedInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Restricted cash investments							296,000,000rig_RestrictedCashAndInvestments1 / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	377,000,000rig_RestrictedCashAndInvestments1 / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember			288,000,000rig_RestrictedCashAndInvestments1 / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	369,000,000rig_RestrictedCashAndInvestments1 / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	8,000,000rig_RestrictedCashAndInvestments1 / us-gaap_DebtInstrumentAxis = rig_CertainContingentObligationsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	8,000,000rig_RestrictedCashAndInvestments1 / us-gaap_DebtInstrumentAxis = rig_CertainContingentObligationsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember					301,000,000rig_RestrictedCashAndInvestments1 / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	386,000,000rig_RestrictedCashAndInvestments1 / us-gaap_DebtInstrumentAxis = rig_EksportfinansNotesDue2018Member / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Long-term debt, including current maturities							10,020,000,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	10,092,000,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember							8,834,000,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	9,778,000,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Derivative instruments, assets							33,000,000us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	15,000,000us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember							33,000,000us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	15,000,000us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carrying amount of cash equivalents	1,800,000,000us-gaap_CashEquivalentsAtCarryingValue	1,700,000,000us-gaap_CashEquivalentsAtCarryingValue
Debt
Fixed rate debt							$ 10,000,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	$ 10,100,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember									$ 8,800,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	$ 9,800,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

X

- Definition

The carrying amount of cash and investments which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regards to particular deposits; however, time deposits and short-term certificates of deposits are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet.

+ References

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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-Section S99

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-Subparagraph (SX 210.5-02.1)

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

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