SUPPLEMENTARY CONSOLIDATED FINANCIAL STATEMENT SCHEDULE VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 253	$ 174	$ 134
Charged to Costs and Expense	93	113	75
Charged to Other Accounts	9	(1)	0
Deductions From Allowance Accounts	(70)	(33)	(35)
Balance at End of Year	285	253	174
Allowances for doubtful accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	212	141	112
Charged to Costs and Expense	93	113	67
Charged to Other Accounts	7	2	0
Deductions From Allowance Accounts	(69)	(44)	(38)
Balance at End of Year	243	212	141
Other allowances
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	41	33	22
Charged to Costs and Expense	0	0	8
Charged to Other Accounts	2	(3)	0
Deductions From Allowance Accounts	(1)	11	3
Balance at End of Year	42	41	33
Written off
Valuation and Qualifying Accounts Disclosure [Line Items]
Deductions From Allowance Accounts	(70)	(33)	(34)
Credited to other accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Deductions From Allowance Accounts	0	0	(1)
Amounts shown as deductions from current and non-current receivables
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	253	174
Balance at End of Year	$ 285	$ 253	$ 174