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SUPPLEMENTARY CONSOLIDATED FINANCIAL STATEMENT SCHEDULE VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 261 $ 282 $ 297
Charged to Costs and Expenses 29 15 91
Charged to Other Accounts (31) 10 (19)
Deductions From Allowance Accounts (108) (46) (87)
Balance at End of Year 151 261 282
Current allowances 144 250 265
Allowances for credit losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 211 252 273
Charged to Costs and Expenses 29 4 91
Charged to Other Accounts (35) 1 (19)
Deductions From Allowance Accounts (106) (46) (93)
Balance at End of Year 99 211 252
Other allowances      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 50 30 24
Charged to Costs and Expenses 0 11 0
Charged to Other Accounts 4 9 0
Deductions From Allowance Accounts (2) 0 6
Balance at End of Year 52 50 30
Written-off      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Deductions From Allowance Accounts (106) (40) (93)
Credited to other accounts and other      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Deductions From Allowance Accounts $ (2) $ (6) $ 6