Goodwill And Acquisition-Related Intangibles, Net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 years	Sep. 30, 2010	Mar. 31, 2011 years
Finite-Lived Intangible Assets [Line Items]
Amortization of acquisition-related intangibles	$ 21	$ 18	$ 37	$ 36
Estimated useful life of finite-lived intangible assets, minimum			2
Estimated useful life of finite-lived intangible assets, maximum			14
Weighted-average remaining useful life of finite-lived intangible assets (in years)			6.0		5.1
Cost Of Goods Sold [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of acquisition-related intangibles	$ 8	$ 3	$ 11	$ 6