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Postemployment Benefit Plans (Costs) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
plan
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Net periodic benefit costs, before tax      
Interest cost $ 74 $ 56 $ 53
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)  
Expected return on plan assets $ (95) $ (72) (79)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)  
Settlements and curtailments     (2)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)  
Actuarial loss, net $ 2 $ 5 12
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)  
Prior service gain, net $ (2) $ (2) (2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)  
Net periodic benefit costs (income) $ (21) $ (13) $ (18)
U.S.      
Weighted-average assumptions      
Discount rate (as a percent) 5.06% 2.92% 2.60%
Expected rate of return (as a percent) 6.41% 4.81% 5.51%
U.S. | Funded Plan      
Postemployment Benefit Plans      
Number of benefit plans | plan 3    
U.S. | Unfunded Plan      
Postemployment Benefit Plans      
Number of benefit plans | plan 3    
U.K.      
Weighted-average assumptions      
Discount rate (as a percent) 4.80% 1.90% 1.50%
Expected rate of return (as a percent) 5.00% 2.00% 3.20%
U.K. | Funded Plan      
Postemployment Benefit Plans      
Number of benefit plans | plan 1    
Transocean Plans | U.S.      
Net periodic benefit costs, before tax      
Interest cost $ 65 $ 50 $ 47
Expected return on plan assets (84) (65) (66)
Actuarial loss, net   5 11
Net periodic benefit costs (income) (19) (10) (8)
Transocean Plans | Non-U.S. Plans      
Net periodic benefit costs, before tax      
Interest cost   6 6
Expected return on plan assets   (7) (13)
Settlements and curtailments     (2)
Actuarial loss, net     1
Net periodic benefit costs (income)   $ (1) $ (8)
Transocean Plans | U.K.      
Net periodic benefit costs, before tax      
Interest cost 9    
Expected return on plan assets (11)    
Actuarial loss, net $ 2    
OPEB Plans      
Weighted-average assumptions      
Discount rate (as a percent) 4.92% 1.83% 1.21%
Net periodic benefit costs, before tax      
Prior service gain, net $ (2) $ (2) $ (2)
Net periodic benefit costs (income) $ (2) $ (2) $ (2)