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Noncontrolling Interest (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015
Noncontrolling interest |
Dividends received eliminated in consolidation | $ 18 rig_SubsidiaryDividendsEliminated
Transocean Partners |
Noncontrolling interest |
Dividends | $ 25 rig_SubsidiaryDividends / dei_LegalEntityAxis = rig_TransoceanPartnersLlcMember

X
- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock from subsidiary. + References No definition available. + Details
Name: | rig_SubsidiaryDividends
Namespace Prefix: | rig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Dividends received from a subsidiary eliminated in the consolidated financial statements. + References No definition available. + Details
Name: | rig_SubsidiaryDividendsEliminated
Namespace Prefix: | rig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_MinorityInterestLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=rig_TransoceanPartnersLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |