SUPPLEMENTARY CONSOLIDATED FINANCIAL STATEMENT SCHEDULE VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 297	$ 226	$ 285
Charged to Costs and Expense	91	132	44
Charged to Other Accounts	(19)	(16)	10
Deductions From Allowance Accounts	(87)	(45)	(113)
Balance at End of Year	282	297	226
Current allowances	265	279	216
Allowances for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	273	187	243
Charged to Costs and Expense	91	132	44
Charged to Other Accounts	(19)	(1)	13
Deductions From Allowance Accounts	(93)	(45)	(113)
Balance at End of Year	252	273	187
Other allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	24	39	42
Charged to Costs and Expense	0	0	0
Charged to Other Accounts	0	(15)	(3)
Deductions From Allowance Accounts	6	0	0
Balance at End of Year	30	24	39
Written off
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Deductions From Allowance Accounts	(93)	(45)	(113)
Credited to other accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Deductions From Allowance Accounts	$ 6	$ 0	$ 0