Business (Details)	Sep. 30, 2020 item
Number of mobile offshore drilling units	38
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	11

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

No definition available.

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