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, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 7	$ 11	$ 21	$ 37
Cost of product
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	15	10	32	18
Cost of service and other
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	8	4	20	7
Operating expenses
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	7	11	21	37
Total amortization
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 30	$ 25	$ 73	$ 62