Valuation And Qualifying Accounts (Details) (Allowance For Doubtful Accounts, Price Protection And Returns [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Allowance For Doubtful Accounts, Price Protection And Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 200		$ 252		$ 304
Charged to Revenue, Costs and Expenses	355		371		463
Charged (Credited) to Other Accounts	3	[1]	(4)	[1]	(13)	[1]
Deductions	(372)	[2]	(419)	[2]	(502)	[2]
Balance at End of Period	$ 186		$ 200		$ 252

[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.