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SUPPLEMENTARY CONSOLIDATED FINANCIAL STATEMENT SCHEDULE VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 285 $ 253 $ 174
Charged to Costs and Expense 44 93 113
Charged to Other Accounts 10 9 (1)
Deductions From Allowance Accounts (113) (70) (33)
Balance at End of Year 226 285 253
Allowances for doubtful accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 243 212 141
Charged to Costs and Expense 44 93 113
Charged to Other Accounts 13 7 2
Deductions From Allowance Accounts (113) (69) (44)
Balance at End of Year 187 243 212
Other allowances      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 42 41 33
Charged to Costs and Expense 0 0 0
Charged to Other Accounts (3) 2 (3)
Deductions From Allowance Accounts 0 (1) 11
Balance at End of Year 39 42 41
Written off      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Deductions From Allowance Accounts (113) (70) (33)
Credited to other accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Deductions From Allowance Accounts 0 0 0
Amounts shown as deductions from current and non-current receivables      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 285 253  
Balance at End of Year $ 226 $ 285 $ 253