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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Earnings for basic computations $ 930 $ 601 $ 270
Earnings for diluted computations $ 930 $ 601 $ 270
Weighted-average common stock shares outstanding, basic (in shares) 127,763,166 130,366,501 132,161,646
Dilutive stock options and restricted stock (in shares) 527,251 449,402 554,790
Weighted-average common stock shares outstanding, diluted (in shares) 128,290,417 130,815,903 132,716,436
Earnings per share of common share:      
Basic (in dollars per share) $ 7.28 $ 4.61 $ 2.04
Diluted (in dollars per share) $ 7.25 $ 4.59 $ 2.03
Cash dividends paid $ 268 $ 254 $ 236
Restricted Stock      
Earnings per share of common share:      
Unvested shares participating in the payment of the company's dividends declared (in shares) 700,000 1,100,000 1,100,000
Cash dividends paid $ 1 $ 2 $ 2
Undistributed earnings (loss) allocated to participating securities, basic 4 3 0
Undistributed earnings (loss) allocated to participating securities, diluted $ 4 $ 3 $ 0