Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 7	$ 13
Cost of product
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	9	2
Cost of service and other
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	6	1
Operating expenses
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	7	13
Total amortization
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 22	$ 16