Acquisitions (Allocation Of Acquisition Costs) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Acquisitions [Abstract]
Cash	$ 135
Contingent consideration	13	13
Total Consideration	148	106
Allocation of purchase price:
Cash and cash equivalents	20
Accounts Receivable, net	3
Property, plant, and equipment	2
Intangible Assets	66
Goodwill	89
Other assets	6
Total assets acquired	186
Current liabilities	6
Other Liabilities	32
Total liabilities assumed	38	21
Net assets acquired	$ 148