v3.26.1
Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Earnings for basic computations $ 845 $ 930 $ 601
Earnings for diluted computations $ 845 $ 930 $ 601
Weighted-average common stock shares outstanding, basic (in shares) 122,071,669 127,763,166 130,366,501
Dilutive stock options and restricted stock (in shares) 303,482 527,251 449,402
Weighted-average common stock shares outstanding, diluted (in shares) 122,375,151 128,290,417 130,815,903
Earnings per share of common share:      
Basic (in dollars per share) $ 6.92 $ 7.28 $ 4.61
Diluted (in dollars per share) $ 6.90 $ 7.25 $ 4.59
Cash dividends paid $ 276 $ 268 $ 254
Restricted Stock      
Earnings per share of common share:      
Unvested shares participating in the payment of the company's dividends declared (in shares) 900,000 700,000 1,100,000
Cash dividends paid $ 2 $ 1 $ 2
Undistributed earnings (loss) allocated to participating securities, basic 4 4 3
Undistributed earnings (loss) allocated to participating securities, diluted $ 4 $ 4 $ 3