Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 7	$ 13	$ 14	$ 26
Cost of product
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	8	6	17	8
Cost of service and other
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	6	2	12	3
Operating expenses
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	7	13	14	26
Total amortization
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 21	$ 21	$ 43	$ 37