Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 4	$ 7
Cost of product
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	9	9
Cost of service and other
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	6	6
Operating expenses
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	4	7
Total amortization
Finite-Lived Intangible Assets Classified by Expense
Amortization of intangibles	$ 19	$ 22