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Commitments and Contingencies (Letters of credit and surety bonds) (Details) - Letters of credit and surety bonds - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Letters of credit and surety bonds |  |
Outstanding letters of credit | $ 19 | $ 31
Aggregate cash collateral | 10 | 5
Surety bonds outstanding | $ 113 | $ 84

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- Definition Outstanding amount of surety bonds that secure customs obligations relating to the importation of our rigs and certain performance and other obligations. + References No definition available. + Details
Name: | rig_OutstandingSuretyBonds
Namespace Prefix: | rig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=rig_LettersOfCreditAndSuretyBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |