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Loss/Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Earnings Per Share [Abstract]                  
Common shares, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01       $ 0.01   $ 0.01
Net (loss)/income $ (11) $ (42) $ (14) $ 32 $ 253 $ 60 $ (67) $ 345  
Effect of dilution (interest on unsecured senior convertible bond) 1     1     4 4  
Diluted (loss)/income available to stockholders $ (10)     $ 33     $ (63) $ 349  
Basic (loss)/earnings per share:                  
Weighted average number of common shares outstanding (in shares) 62     67     62 70  
Diluted (loss)/earnings per share:                  
Effect on dilution (in shares) 3     3     3 3  
Weighted average number of common shares outstanding adjusted for the effects of dilution (in shares) 65     70     65 73  
Basic (loss)/earnings per share (in usd per share) $ (0.17)     $ 0.49     $ (1.08) $ 4.97  
Diluted (loss)/earnings per share (in usd per share) $ (0.17)     $ 0.49     $ (1.08) $ 4.82