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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	$ 18rig_SubsidiaryDividendsEliminated
Transocean Partners
Noncontrolling interest
Dividends	$ 25rig_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: