v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator (basic and diluted):        
Net income $ 152 $ 167 $ 378 $ 380
Denominator:        
Weighted average number of shares outstanding (basic) (in shares) 115,342,204 118,953,510 116,033,457 119,176,259
Effect of dilutive securities (in shares) 413,055 439,309 480,475 505,007
Weighted average number of shares outstanding (diluted) (in shares) 115,755,259 119,392,819 116,513,932 119,681,266
Earnings per share:        
Basic (in dollars per share) $ 1.32 $ 1.40 $ 3.26 $ 3.19
Diluted (in dollars per share) $ 1.32 $ 1.40 $ 3.25 $ 3.18
Restricted Stock Units        
Earnings per share:        
Shares excluded in the diluted earnings per share calculation (in shares) 472,816 920,270 476,813 838,208