v3.26.3
Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]        
Earnings for basic computations $ 179 $ 174 $ 375 $ 443
Earnings for diluted computations $ 179 $ 174 $ 375 $ 443
Weighted-average common stock shares outstanding, basic (in shares) 119,552,012 122,662,037 119,758,635 123,388,093
Dilutive stock options and restricted stock (in shares) 39,625 219,526 128,344 289,899
Weighted-average common stock shares outstanding, diluted (in shares) 119,591,637 122,881,563 119,886,979 123,677,992
Earnings per common share:        
Basic (in dollars per share) $ 1.50 $ 1.42 $ 3.13 $ 3.59
Diluted (in dollars per share) $ 1.50 $ 1.42 $ 3.13 $ 3.58
Restricted Stock        
Earnings per common share:        
Unvested shares participating in the payment of the company's dividends declared (in shares) 1,400,000 900,000 1,200,000 900,000