Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 16	$ 30	$ 43
Cost of product
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	33	55	35
Cost of service and other
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	27	38	17
Operating expenses
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	16	30	43
Total amortization
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 76	$ 123	$ 95