Valuation And Qualifying Accounts (Details) - Allowance For Doubtful Accounts, Price Protection And Returns [Member] - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 140	$ 186	$ 200
Charged to Revenue, Costs and Expenses		269	361	321
Charged (Credited) to Other Accounts	[1]	11	(66)	37
Deductions	[2]	(261)	(341)	(372)
Balance at End of Period		$ 159	$ 140	$ 186

[1] Primarily other reclassification adjustments and the translation effect of using the average exchange rate for expense items and the year-end exchange rate for the balance sheet item (allowance account).

[2] Primarily the utilization of returns allowance and price protection reserves.