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Financing Arrangement (Schedule Of Interest Expense Related To Notes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2011
Financing Arrangement [Abstract]
Amortization of debt discount	$ 5	$ 9
Amortization of debt issuance costs		1
Coupon interest expense	1	2
Total interest expense related to Notes	$ 6	$ 12

The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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