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Postemployment Benefit Plans (Costs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net periodic benefit costs, before tax      
Service cost $ 7 $ 7 $ 6
Interest cost 74 72 76
Expected return on plan assets (88) (91) (94)
Special termination benefits   1  
Settlements and curtailments 3 (5) 13
Actuarial loss, net 3 9 7
Prior service gain, net (2) (2) (3)
Net periodic benefit costs (income) (3) (9) 5
OPEB Plans      
Net periodic benefit costs, before tax      
Interest cost 1 1  
Special termination benefits   1  
Settlements and curtailments   (4)  
Actuarial loss, net     1
Prior service gain, net (2) (2) (3)
Net periodic benefit costs (income) (1) (4) (2)
U.S. | Transocean Plans      
Net periodic benefit costs, before tax      
Service cost     3
Interest cost 63 61 65
Expected return on plan assets (71) (72) (74)
Settlements and curtailments 1    
Actuarial loss, net 3 8 5
Net periodic benefit costs (income) (4) (3) (1)
Non-U.S. Plans | Transocean Plans      
Net periodic benefit costs, before tax      
Service cost 7 7 3
Interest cost 10 10 11
Expected return on plan assets (17) (19) (20)
Settlements and curtailments 2 (1) 13
Actuarial loss, net   1 1
Net periodic benefit costs (income) $ 2 $ (2) $ 8