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Postemployment Benefit Plans (AOCI) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Unrecognized accumulated other comprehensive income, before tax    
Actuarial loss, net $ 390 $ 371
Prior service cost, net (14) (15)
Total 376 356
Accumulated other comprehensive income expected to be recognized during the next fiscal year    
Actuarial loss, net 10  
Prior service cost, net (2)  
Total amount expected to be recognized 8  
OPEB Plans    
Unrecognized accumulated other comprehensive income, before tax    
Actuarial loss, net 2 1
Prior service cost, net (14) (16)
Total (12) (15)
Accumulated other comprehensive income expected to be recognized during the next fiscal year    
Prior service cost, net (2)  
Total amount expected to be recognized (2)  
U.S. | Transocean Plans    
Unrecognized accumulated other comprehensive income, before tax    
Actuarial loss, net 304 307
Total 304 307
Accumulated other comprehensive income expected to be recognized during the next fiscal year    
Actuarial loss, net 9  
Total amount expected to be recognized 9  
Non-U.S. Plans | Transocean Plans    
Unrecognized accumulated other comprehensive income, before tax    
Actuarial loss, net 84 63
Prior service cost, net   1
Total 84 $ 64
Accumulated other comprehensive income expected to be recognized during the next fiscal year    
Actuarial loss, net 1  
Total amount expected to be recognized $ 1