v3.26.1
Revenues (Disaggregation) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenue    
Contract drilling revenues $ 1,081 $ 906
U.S.    
Revenue    
Contract drilling revenues 433 394
Brazil    
Revenue    
Contract drilling revenues 232 192
Norway    
Revenue    
Contract drilling revenues 179 159
Other Countries    
Revenue    
Contract drilling revenues 237 161
Ultra-deepwater floaters    
Revenue    
Contract drilling revenues 748 658
Ultra-deepwater floaters | U.S.    
Revenue    
Contract drilling revenues 433 394
Ultra-deepwater floaters | Brazil    
Revenue    
Contract drilling revenues 232 192
Ultra-deepwater floaters | Other Countries    
Revenue    
Contract drilling revenues 83 72
Harsh environment floaters    
Revenue    
Contract drilling revenues 333 248
Harsh environment floaters | Norway    
Revenue    
Contract drilling revenues 179 159
Harsh environment floaters | Other Countries    
Revenue    
Contract drilling revenues $ 154 $ 89