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Postemployment Benefit Plans (Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Transocean Plans        
Net periodic benefit costs, before tax        
Service cost $ 1 $ 5 $ 3 $ 10
Interest cost 19 22 38 43
Expected return on plan assets (24) (26) (47) (52)
Settlements and curtailments 5 (2) 5 (2)
Actuarial loss, net 2 2 3 4
Prior service cost, net   (2) (1) (2)
Net periodic benefit costs 3 (1) 1 1
Funding contributions 1 4 9 43
U.S. Plans        
Net periodic benefit costs, before tax        
Service cost 1 1 2 2
Interest cost 17 17 33 34
Expected return on plan assets (19) (20) (37) (40)
Settlements and curtailments   1   1
Actuarial loss, net 2 1 3 2
Net periodic benefit costs 1   1 (1)
Funding contributions   2 1 2
Non-U.S. Plans        
Net periodic benefit costs, before tax        
Service cost   4 1 8
Interest cost 2 4 5 8
Expected return on plan assets (5) (6) (10) (12)
Settlements and curtailments 5 (1) 5 (1)
Actuarial loss, net   1   2
Net periodic benefit costs 2 2 1 5
Funding contributions $ 1 2 7 40
OPEB Plans        
Net periodic benefit costs, before tax        
Interest cost   1   1
Settlements and curtailments   (2)   (2)
Prior service cost, net   (2) (1) (2)
Net periodic benefit costs   $ (3) (1) (3)
Funding contributions     $ 1 $ 1