SUPPLEMENTARY CONSOLIDATED FINANCIAL STATEMENT SCHEDULE VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 282	$ 297	$ 226
Charged to Costs and Expense	15	91	132
Charged to Other Accounts	10	(19)	(16)
Deductions From Allowance Accounts	(46)	(87)	(45)
Balance at End of Year	261	282	297
Current allowances	250	265	279
Allowances for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	252	273	187
Charged to Costs and Expense	4	91	132
Charged to Other Accounts	1	(19)	(1)
Deductions From Allowance Accounts	(46)	(93)	(45)
Balance at End of Year	211	252	273
Other allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	30	24	39
Charged to Costs and Expense	11	0	0
Charged to Other Accounts	9	0	(15)
Deductions From Allowance Accounts	0	6	0
Balance at End of Year	50	30	24
Written-off
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Deductions From Allowance Accounts	(40)	(93)	(45)
Credited to other accounts and other
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Deductions From Allowance Accounts	$ (6)	$ 6	$ 0