v3.26.1
Employee Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Other Pension, Postretirement and Supplemental Plans      
Defined Benefit Plan Disclosure [Line Items]      
Employees’ capital accumulation plan, total expense recognized $ 226 $ 249 $ 218
Employees’ capital accumulation plan, company-paid contributions $ 232 $ 240 $ 213
Other Postretirement Benefits Plan | Officer Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average discount rate for benefit obligation (as a percent) 5.85% 5.55% 5.20%