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Income Taxes - Components of Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Current      
U.S. Federal $ 280 $ 229 $ 355
State and local 90 117 87
Foreign 5 3 9
Total current 375 349 451
Deferred      
U.S. Federal (73) (94) (300)
State and local (18) (6) (50)
Foreign 0 (1) (4)
Total deferred (91) (101) (354)
Total $ 284 $ 248 $ 97