v3.25.2
Capital Stock and Earnings Per Share (OMH Only) - Schedule of Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Numerator (basic and diluted):        
Net income $ 167 $ 71 $ 380 $ 225
Denominator:        
Weighted average number of shares outstanding (basic) (in shares) 118,953,510 119,787,550 119,176,259 119,808,362
Effect of dilutive securities (in shares) 439,309 397,631 505,007 406,563
Weighted average number of shares outstanding (diluted) (in shares) 119,392,819 120,185,181 119,681,266 120,214,925
Earnings per share:        
Basic (in dollars per share) $ 1.40 $ 0.59 $ 3.19 $ 1.88
Diluted (in dollars per share) $ 1.40 $ 0.59 $ 3.18 $ 1.87
Restricted Stock Units        
Earnings per share:        
Shares excluded in the diluted earnings per share calculation (in shares) 920,270 706,042 838,208 701,837