Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 4	$ 7	$ 12	$ 21
Cost of product
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	10	15	27	32
Cost of service and other
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	6	8	18	20
Operating expenses
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	4	7	12	21
Total amortization
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 20	$ 30	$ 57	$ 73