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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 | $ 2,451 us-gaap_ConstructionInProgressGross |  | $ 2,710 us-gaap_ConstructionInProgressGross |  |
Total capital expenditures | 201 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 1,131 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  |
Changes in accrued capital expenditures | (22)rig_ChangeInAccrualOfConstructionInProgressExpenditures |  | (48)rig_ChangeInAccrualOfConstructionInProgressExpenditures |  |
Construction work in progress, at end of period | 2,539 us-gaap_ConstructionInProgressGross |  | 3,615 us-gaap_ConstructionInProgressGross |  |
Number of High Specification Jackups under construction | 5 rig_NumberOfHighSpecificationJackupsUnderConstructions |  |  |  |
Number of Ultra-Deepwater Floaters under construction | 2 rig_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 |  |  |  |  | 272 rig_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 |  |  | 442 us-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 |  |  | 230 us-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 | 25 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_DeepwaterThalassaMember | [3] | 32 us-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 | 9 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_DeepwaterProteusMember | [3] | 6 us-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 | 18 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_DeepwaterConquerorMember | [4] | 80 us-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 | 18 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_DeepwaterPontusMember | [3] | 79 us-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 | 6 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_DeepwaterPoseidonMember | [3] | 24 us-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 | 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_UltraDeepwaterDrillshipTBN1Member | [5] | 27 us-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 | 1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_TransoceanCassiopeiaMember | [6] | 1 us-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 |  |  | 27 us-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 | 1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_TransoceanCentaurusMember | [6] | 1 us-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 | 1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_TransoceanCepheusMember | [6] | 1 us-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 | 1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_TransoceanCetusMember | [6] | 1 us-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 | 1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_TransoceanCircinusMember | [6] | 1 us-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 | 118 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / rig_ActualCapitalExpendituresAndOtherCapitalAdditionsIncludingCapitalizedInterestAxis = rig_OtherConstructionProjectsAndCapitalAdditionsMember |  | 179 us-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&#160;Conqueror, a newbuild UltraDeepwater drillship under construction at the Daewoo Shipbuilding & Marine Engineering&#160;Co.&#160;Ltd. shipyard in Korea, is expected to commence operations in the fourth&#160;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.

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