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Equity (Details) shares in Millions | Dec. 31, 2019 subsidiary shares | Dec. 31, 2018 shares
--- | --- | ---
Equity |  |
Number of subsidiaries to whom shares were issued | subsidiary | 1 |
Number of shares held by subsidiary | shares | 6.1 | 0.9

X
- Definition The number of shares held by subsidiary, which were issued for the purpose of granting the shares to senior employees as part of an employee stock option plan approved by the Entity's Board of Directors. + References No definition available. + Details
Name: | rig_CommonStockHeldBySubsidiaryShares
Namespace Prefix: | rig_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of subsidiaries to whom shares were issued for future use to satisfy our obligations to deliver shares in connection with awards granted under our incentive plans or other rights to acquire our shares. + References No definition available. + Details
Name: | rig_NumberOfSubsidiariesToWhomSharesWereIssued
Namespace Prefix: | rig_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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