v3.25.2
Earnings Per Share - Calculation of Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]                      
Net income (loss) $ 18 $ 47 $ 21 $ 22 $ (97) $ 61 $ 65 $ (36) $ 7 $ (126) $ (42)
Basic weighted-average shares outstanding (in shares) 125       135   125 135      
Effect of potentially dilutive securities:                      
Restricted stock awards (in shares) 1       0   1 0      
Diluted weighted-average shares outstanding (in shares) 126       135   125 135      
Basic earnings (loss) per share (in dollars per share) $ 0.15       $ (0.72)   $ 0.53 $ (0.27) $ 0.05 $ (0.92) $ (0.30)
Diluted earnings (loss) per share (in dollars per share) $ 0.14       $ (0.72)   $ 0.52 $ (0.27) $ 0.05 $ (0.92) $ (0.30)
Potential shares excluded from computation of earnings per share (in shares) 0       2   0 2