v3.21.1

Business (Details)	Mar. 31, 2021 item
Number of mobile offshore drilling units	37
Ultra-deepwater floaters
Number of mobile offshore drilling units	27
Number of mobile offshore drilling units under construction	2
Harsh environment floaters
Number of mobile offshore drilling units	10

X

- Definition

Number of mobile offshore drilling units.

+ References

No definition available.

+ Details

Name:	rig_NumberOfMobileOffshoreDrillingUnits
Namespace Prefix:	rig_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of mobile offshore drilling units under construction we own, had partial ownership interests in or operated at the measurement date.

+ References

No definition available.

+ Details

Name:	rig_NumberOfMobileOffshoreDrillingUnitsUnderConstruction
Namespace Prefix:	rig_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=rig_UltraDeepwaterFloatersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=rig_HarshEnvironmentFloatersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: