v2.4.0.8
Postemployment Benefit Plans (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net periodic benefit costs, before tax      
Service cost $ 83 $ 81  
Interest cost 90 85  
Special termination benefits 1 1  
Net periodic benefit costs 132 149 88
Unrecognized accumulated other comprehensive income, before tax      
Actuarial loss, net 322 565  
Prior service cost, net (9) (10)  
Transition obligation, net (2)    
Total 311 555  
Accumulated other comprehensive income expected to be recognized during the next fiscal year      
Actuarial loss, net 25    
Prior service cost, net (2)    
Total amount expected to be recognized 23    
Defined benefit plan contributions funded by cash flows from operations      
Defined benefit plan contributions funded by cash flows from operations 115 159 103
Projected pension benefits payments      
2014 73    
2015 67    
2016 72    
2017 78    
2018 84    
2019-2023 527    
Transocean Plans
      
Net periodic benefit costs, before tax      
Service cost 82 80 64
Interest cost 88 83 80
Expected return on plan assets (95) (84) (86)
Settlements and curtailments 5 22 3
Special termination benefits 1 1  
Actuarial losses, net 48 45 27
Prior service cost, net   (1) (1)
Net periodic benefit costs 129 146 87
Defined benefit plan contributions funded by cash flows from operations      
Expected defined plan contributions in 2014 69    
U.S. Plans
      
Net periodic benefit costs, before tax      
Service cost 55 49 43
Interest cost 63 59 58
Expected return on plan assets (70) (62) (63)
Settlements and curtailments 2 3 2
Special termination benefits 1 1  
Actuarial losses, net 45 41 23
Prior service cost, net (1) (2) (1)
Net periodic benefit costs 95 89 62
Unrecognized accumulated other comprehensive income, before tax      
Actuarial loss, net 205 477  
Prior service cost, net (7) (8)  
Total 198 469  
Accumulated other comprehensive income expected to be recognized during the next fiscal year      
Actuarial loss, net 20    
Prior service cost, net (1)    
Total amount expected to be recognized 19    
Projected pension benefits payments      
2014 48    
2015 52    
2016 57    
2017 63    
2018 67    
2019-2023 420    
Non-U.S. Plans
      
Net periodic benefit costs, before tax      
Service cost 27 31 21
Interest cost 25 24 22
Expected return on plan assets (25) (22) (23)
Settlements and curtailments 3 19 1
Actuarial losses, net 3 4 4
Prior service cost, net 1 1  
Net periodic benefit costs 34 57 25
Unrecognized accumulated other comprehensive income, before tax      
Actuarial loss, net 116 80  
Transition obligation, net (2)    
Total 114 80  
Accumulated other comprehensive income expected to be recognized during the next fiscal year      
Actuarial loss, net 5    
Total amount expected to be recognized 5    
Projected pension benefits payments      
2014 22    
2015 11    
2016 11    
2017 11    
2018 13    
2019-2023 86    
OPEB Plans
      
Net periodic benefit costs, before tax      
Service cost 1 1  
Interest cost 2 2  
Net periodic benefit costs 3 3 1
Unrecognized accumulated other comprehensive income, before tax      
Actuarial loss, net 1 8  
Prior service cost, net (2) (2)  
Total (1) 6  
Accumulated other comprehensive income expected to be recognized during the next fiscal year      
Prior service cost, net (1)    
Total amount expected to be recognized (1)    
Defined benefit plan contributions funded by cash flows from operations      
Expected defined plan contributions in 2014 3    
Projected pension benefits payments      
2014 3    
2015 4    
2016 4    
2017 4    
2018 4    
2019-2023 $ 21