v2.4.0.8
Drilling Fleet (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 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 $ 2,010 $ 1,391 $ 1,459
Total capital expenditures 2,238 1,303 974
Changes in accrued capital expenditures 44 61 (2)
Acquisition of construction work in progress     272
Impairment of certain corporate assets under construction (17)    
Construction work in progress, at end of period 2,710 2,010 1,391
Number of High Specification Jackups under construction 5    
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
Deepwater Champion
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures     76
Property and equipment placed into service     (881)
Transocean Honor
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures   35 129
Property and equipment placed into service   (262)  
Ownership interest in affiliate (as a percent) 70.00%    
Costs as a percentage of total expenditures incurred since inception 100.00%    
Transocean Siam Driller
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 74 39 113
Property and equipment placed into service (236)    
Transocean Andaman
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 82 38 113
Property and equipment placed into service (242)    
Transocean Ao Thai
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 90 72 80
Property and equipment placed into service (242)    
Deepwater Asgard
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 309 46 4
Deepwater Invictus
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 65 40 3
Deepwater Thalassa
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 154 139  
Deepwater Proteus
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 146 128  
Deepwater Pontus
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 65 76  
Deepwater Poseidon
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 66 76  
Deepwater Conqueror
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 108    
High-Specification Jackup TBN1
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 44    
High-Specification Jackup TBN2
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 44    
High-Specification Jackup TBN3
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 44    
High-Specification Jackup TBN4
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 44    
High Specification Jackup TBN5
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 44    
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 859 614 456
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 $ (845) $ (483) $ (431)
Deepwater Thalassa, Deepwater Proteus, Deepwater Pontus and Deepwater Poseidon
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Number of Ultra-Deepwater Floaters under construction 4    
Deepwater Asgard and Deepwater Invictus
      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Number of Ultra-Deepwater Floaters under construction 2