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Drilling Fleet (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
Oct. 31, 2011
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Construction work in progress, at beginning of period $ 2,451us-gaap_ConstructionInProgressGross $ 2,710us-gaap_ConstructionInProgressGross  
Total capital expenditures 201us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 1,131us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Changes in accrued capital expenditures (22)rig_ChangeInAccrualOfConstructionInProgressExpenditures (48)rig_ChangeInAccrualOfConstructionInProgressExpenditures  
Construction work in progress, at end of period 2,539us-gaap_ConstructionInProgressGross 3,615us-gaap_ConstructionInProgressGross  
Number of High Specification Jackups under construction 5rig_NumberOfHighSpecificationJackupsUnderConstructions    
Number of Ultra-Deepwater Floaters under construction 2rig_NumberOfUltraDeepwaterFloatersUnderConstruction    
Aker Drilling      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Acquisition of construction work in progress     272rig_AcquisitionOfConstructionWorkInProgress
/ us-gaap_BusinessAcquisitionAxis
= rig_AkerDrillingMember
Deepwater Invictus      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures   442us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterInvictusMember		 [1],[2]  
Deepwater Asgard      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures   230us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterAsgardMember		 [1],[2]  
Deepwater Thalassa      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 25us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterThalassaMember		 [3] 32us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterThalassaMember		 [3]  
Deepwater Proteus      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterProteusMember		 [3] 6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterProteusMember		 [3]  
Deepwater Conqueror      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 18us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterConquerorMember		 [4] 80us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterConquerorMember		 [4]  
Deepwater Pontus      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 18us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterPontusMember		 [3] 79us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterPontusMember		 [3]  
Deepwater Poseidon      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterPoseidonMember		 [3] 24us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_DeepwaterPoseidonMember		 [3]  
Ultra-Deepwater drillship TBN1      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 2us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_UltraDeepwaterDrillshipTBN1Member		 [5] 27us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_UltraDeepwaterDrillshipTBN1Member		 [5]  
Transocean Cassiopeia      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCassiopeiaMember		 [6] 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCassiopeiaMember		 [6]  
Ultra-Deepwater drillship TBN2      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures   27us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_UltraDeepwaterDrillshipTBN2Member		 [5]  
Transocean Centaurus      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCentaurusMember		 [6] 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCentaurusMember		 [6]  
Transocean Cepheus      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCepheusMember		 [6] 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCepheusMember		 [6]  
Transocean Cetus      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCetusMember		 [6] 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCetusMember		 [6]  
Transocean Circinus      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCircinusMember		 [6] 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_TransoceanCircinusMember		 [6]  
Other construction projects and capital additions      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 118us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_OtherConstructionProjectsAndCapitalAdditionsMember		 179us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= rig_OtherConstructionProjectsAndCapitalAdditionsMember		  
Other property and equipment      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Property and equipment placed into service $ (91)us-gaap_PropertyPlantAndEquipmentTransfersAndChanges
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		 $ (178)us-gaap_PropertyPlantAndEquipmentTransfersAndChanges
/ rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		  
[1] The accumulated construction costs of this rig are no longer included in construction work in progress, as the construction project had been completed as of March 31, 2015.
[2] The Ultra-Deepwater drillships Deepwater Invictus and Deepwater Asgard, commenced operations in July 2014 and August 2014, respectively. The total carrying amount included capitalized costs of $272 million, representing the estimated fair value of construction in progress acquired in connection with our acquisition of Aker Drilling ASA in October 2011.
[3] Deepwater Thalassa, Deepwater Proteus, Deepwater Pontus and Deepwater Poseidon, four newbuild Ultra-Deepwater drillships under construction at the Daewoo Shipbuilding & Marine Engineering Co. Ltd. shipyard in Korea, are expected to commence operations in the first quarter of 2016, the third quarter of 2016, the first quarter of 2017 and the second quarter of 2017, respectively.
[4] Deepwater Conqueror, a newbuild UltraDeepwater drillship under construction at the Daewoo Shipbuilding & Marine Engineering Co. Ltd. shipyard in Korea, is expected to commence operations in the fourth quarter of 2016.
[5] Our two unnamed dynamically positioned UltraDeepwater drillships under construction at the Jurong Shipyard PTE Ltd. in Singapore do not yet have drilling contracts and are expected to be delivered in the second quarter of 2017 and the first quarter of 2018, respectively.
[6] Transocean Cassiopeia, Transocean Centaurus, Transocean Cepheus, Transocean Cetus and Transocean Circinus, five Keppel FELS Super B 400 Bigfoot class design newbuild HighSpecification Jackups under construction at Keppel FELS’ shipyard in Singapore do not yet have drilling contracts and are expected to be delivered in the first quarter of 2018, the third quarter of 2018, the first quarter of 2019, the third quarter of 2019 and the first quarter of 2020, respectively. These delivery expectations reflect our decision to delay delivery in consideration of existing market conditions.