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Postemployment Benefit Plans (Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of plan assets      
Total investments $ 1,985 $ 1,799 $ 1,567
Funding contributions      
Employer contributions 14 $ 22 17
Expected defined plan contributions next year 11    
Projected pension benefits payments      
2021 90    
2022 91    
2023 93    
2024 94    
2025 96    
2026-2030 $ 482    
U.S.      
Weighted-average target allocations of the investments      
Total target allocation percentage 100.00% 100.00%  
Total actual allocation percentage 100.00% 100.00%  
U.S. | Equity securities      
Weighted-average target allocations of the investments      
Total target allocation percentage 50.00% 50.00%  
Total actual allocation percentage 55.00% 51.00%  
U.S. | Fixed income securities      
Weighted-average target allocations of the investments      
Total target allocation percentage 50.00% 50.00%  
Total actual allocation percentage 45.00% 49.00%  
Non-U.S. Plans      
Weighted-average target allocations of the investments      
Total target allocation percentage 100.00% 100.00%  
Total actual allocation percentage 100.00% 100.00%  
Non-U.S. Plans | Equity securities      
Weighted-average target allocations of the investments      
Total target allocation percentage 27.00% 24.00%  
Total actual allocation percentage 25.00% 27.00%  
Non-U.S. Plans | Fixed income securities      
Weighted-average target allocations of the investments      
Total target allocation percentage 73.00% 60.00%  
Total actual allocation percentage 74.00% 56.00%  
Non-U.S. Plans | Other investments      
Weighted-average target allocations of the investments      
Total target allocation percentage   16.00%  
Total actual allocation percentage 1.00% 17.00%  
Transocean Plans      
Fair value of plan assets      
Total investments $ 1,985 $ 1,799  
Funding contributions      
Expected defined plan contributions next year 8    
Transocean Plans | Significant observable inputs      
Fair value of plan assets      
Total investments 1,560 1,361  
Transocean Plans | Significant other observable inputs      
Fair value of plan assets      
Total investments 425 438  
Transocean Plans | Mutual funds      
Fair value of plan assets      
Total investments 1,972 1,719  
Transocean Plans | Mutual funds | Significant observable inputs      
Fair value of plan assets      
Total investments 1,548 1,352  
Transocean Plans | Mutual funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 424 367  
Transocean Plans | U.S. equity funds      
Fair value of plan assets      
Total investments 586 481  
Transocean Plans | U.S. equity funds | Significant observable inputs      
Fair value of plan assets      
Total investments 586 480  
Transocean Plans | U.S. equity funds | Significant other observable inputs      
Fair value of plan assets      
Total investments   1  
Transocean Plans | Non-U.S. equity funds      
Fair value of plan assets      
Total investments 373 336  
Transocean Plans | Non-U.S. equity funds | Significant observable inputs      
Fair value of plan assets      
Total investments 263 216  
Transocean Plans | Non-U.S. equity funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 110 120  
Transocean Plans | Bond funds      
Fair value of plan assets      
Total investments 1,013 902  
Transocean Plans | Bond funds | Significant observable inputs      
Fair value of plan assets      
Total investments 699 656  
Transocean Plans | Bond funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 314 246  
Transocean Plans | Other investments      
Fair value of plan assets      
Total investments 13 80  
Transocean Plans | Other investments | Significant observable inputs      
Fair value of plan assets      
Total investments 12 9  
Transocean Plans | Other investments | Significant other observable inputs      
Fair value of plan assets      
Total investments 1 71  
Transocean Plans | Cash and money market funds      
Fair value of plan assets      
Total investments 12 9  
Transocean Plans | Cash and money market funds | Significant observable inputs      
Fair value of plan assets      
Total investments 12 9  
Transocean Plans | Property collective trusts      
Fair value of plan assets      
Total investments   20  
Transocean Plans | Property collective trusts | Significant other observable inputs      
Fair value of plan assets      
Total investments   20  
Transocean Plans | Investment contracts      
Fair value of plan assets      
Total investments 1 51  
Transocean Plans | Investment contracts | Significant other observable inputs      
Fair value of plan assets      
Total investments 1 51  
Transocean Plans | U.S.      
Fair value of plan assets      
Total investments 1,565 1,369 1,189
Funding contributions      
Employer contributions 3 4  
Projected pension benefits payments      
2021 80    
2022 81    
2023 82    
2024 83    
2025 83    
2026-2030 422    
Transocean Plans | U.S. | Significant observable inputs      
Fair value of plan assets      
Total investments 1,554 1,357  
Transocean Plans | U.S. | Significant other observable inputs      
Fair value of plan assets      
Total investments 11 12  
Transocean Plans | U.S. | Mutual funds      
Fair value of plan assets      
Total investments 1,559 1,364  
Transocean Plans | U.S. | Mutual funds | Significant observable inputs      
Fair value of plan assets      
Total investments 1,548 1,352  
Transocean Plans | U.S. | Mutual funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 11 12  
Transocean Plans | U.S. | U.S. equity funds      
Fair value of plan assets      
Total investments 586 481  
Transocean Plans | U.S. | U.S. equity funds | Significant observable inputs      
Fair value of plan assets      
Total investments 586 480  
Transocean Plans | U.S. | U.S. equity funds | Significant other observable inputs      
Fair value of plan assets      
Total investments   1  
Transocean Plans | U.S. | Non-U.S. equity funds      
Fair value of plan assets      
Total investments 270 221  
Transocean Plans | U.S. | Non-U.S. equity funds | Significant observable inputs      
Fair value of plan assets      
Total investments 263 216  
Transocean Plans | U.S. | Non-U.S. equity funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 7 5  
Transocean Plans | U.S. | Bond funds      
Fair value of plan assets      
Total investments 703 662  
Transocean Plans | U.S. | Bond funds | Significant observable inputs      
Fair value of plan assets      
Total investments 699 656  
Transocean Plans | U.S. | Bond funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 4 6  
Transocean Plans | U.S. | Other investments      
Fair value of plan assets      
Total investments 6 5  
Transocean Plans | U.S. | Other investments | Significant observable inputs      
Fair value of plan assets      
Total investments 6 5  
Transocean Plans | U.S. | Cash and money market funds      
Fair value of plan assets      
Total investments 6 5  
Transocean Plans | U.S. | Cash and money market funds | Significant observable inputs      
Fair value of plan assets      
Total investments 6 5  
Transocean Plans | Non-U.S. Plans      
Fair value of plan assets      
Total investments 420 430 $ 378
Funding contributions      
Employer contributions 9 16  
Projected pension benefits payments      
2021 7    
2022 7    
2023 8    
2024 8    
2025 10    
2026-2030 59    
Transocean Plans | Non-U.S. Plans | Significant observable inputs      
Fair value of plan assets      
Total investments 6 4  
Transocean Plans | Non-U.S. Plans | Significant other observable inputs      
Fair value of plan assets      
Total investments 414 426  
Transocean Plans | Non-U.S. Plans | Mutual funds      
Fair value of plan assets      
Total investments 413 355  
Transocean Plans | Non-U.S. Plans | Mutual funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 413 355  
Transocean Plans | Non-U.S. Plans | Non-U.S. equity funds      
Fair value of plan assets      
Total investments 103 115  
Transocean Plans | Non-U.S. Plans | Non-U.S. equity funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 103 115  
Transocean Plans | Non-U.S. Plans | Bond funds      
Fair value of plan assets      
Total investments 310 240  
Transocean Plans | Non-U.S. Plans | Bond funds | Significant other observable inputs      
Fair value of plan assets      
Total investments 310 240  
Transocean Plans | Non-U.S. Plans | Other investments      
Fair value of plan assets      
Total investments 7 75  
Transocean Plans | Non-U.S. Plans | Other investments | Significant observable inputs      
Fair value of plan assets      
Total investments 6 4  
Transocean Plans | Non-U.S. Plans | Other investments | Significant other observable inputs      
Fair value of plan assets      
Total investments 1 71  
Transocean Plans | Non-U.S. Plans | Cash and money market funds      
Fair value of plan assets      
Total investments 6 4  
Transocean Plans | Non-U.S. Plans | Cash and money market funds | Significant observable inputs      
Fair value of plan assets      
Total investments 6 4  
Transocean Plans | Non-U.S. Plans | Property collective trusts      
Fair value of plan assets      
Total investments   20  
Transocean Plans | Non-U.S. Plans | Property collective trusts | Significant other observable inputs      
Fair value of plan assets      
Total investments   20  
Transocean Plans | Non-U.S. Plans | Investment contracts      
Fair value of plan assets      
Total investments 1 51  
Transocean Plans | Non-U.S. Plans | Investment contracts | Significant other observable inputs      
Fair value of plan assets      
Total investments 1 51  
OPEB Plans      
Funding contributions      
Employer contributions 2 $ 2  
Expected defined plan contributions next year 3    
Projected pension benefits payments      
2021 3    
2022 3    
2023 3    
2024 3    
2025 3    
2026-2030 $ 1