RETIREMENT-RELATED BENEFITS - Investment Strategy (Details)	12 Months Ended
	Mar. 31, 2024
Maximum
Investment Policies And Strategies
Percentage of board members, elected by employees and retirees for managing investments (as a percent)	50.00%
Equity securities
Investment Policies And Strategies
Target allocation (as a percent)	27.00%
Fixed-income securities
Investment Policies And Strategies
Target allocation (as a percent)	46.00%
Real Estate.
Investment Policies And Strategies
Target allocation (as a percent)	6.00%
Insurance contracts
Investment Policies And Strategies
Target allocation (as a percent)	15.00%
Other investments
Investment Policies And Strategies
Target allocation (as a percent)	6.00%