Goodwill And Acquisition-Related Intangibles, Net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 years	Dec. 31, 2010	Mar. 31, 2011 years
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 25	$ 17	$ 62	$ 53
Estimated useful lives, minimum			2
Estimated useful lives, maximum			14
Weighted-average remaining useful life (in years)			5.7		5.1
Cost Of Goods Sold [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 14	$ 3	$ 25	$ 9