v3.26.1
Revenues (Disaggregation) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenue        
Contract drilling revenues $ 966 $ 988 $ 2,047 $ 1,894
U.S.        
Revenue        
Contract drilling revenues 344 408 777 802
Brazil        
Revenue        
Contract drilling revenues 167 221 399 413
Norway        
Revenue        
Contract drilling revenues 177 140 356 299
Australia        
Revenue        
Contract drilling revenues 107 92 209 175
Other Countries        
Revenue        
Contract drilling revenues 171 127 306 205
Ultra-deepwater floaters        
Revenue        
Contract drilling revenues 623 699 1,371 1,357
Ultra-deepwater floaters | U.S.        
Revenue        
Contract drilling revenues 344 408 777 802
Ultra-deepwater floaters | Brazil        
Revenue        
Contract drilling revenues 167 221 399 413
Ultra-deepwater floaters | Other Countries        
Revenue        
Contract drilling revenues 112 70 195 142
Harsh environment floaters        
Revenue        
Contract drilling revenues 343 289 676 537
Harsh environment floaters | Norway        
Revenue        
Contract drilling revenues 177 140 356 299
Harsh environment floaters | Australia        
Revenue        
Contract drilling revenues 107 92 209 175
Harsh environment floaters | Other Countries        
Revenue        
Contract drilling revenues $ 59 $ 57 $ 111 $ 63