Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	2 Months Ended	12 Months Ended
	May 22, 2013	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Business Acquisition [Line Items]
Amount entered into various licensor and development agreements subsequent to the balance sheet date	$ 164
Amount of potential cash payments that could result from unrecognized tax benefits		260
Unrecognized tax benefit with cash deposits		46
Maximum additional consideration payable for business acquisition		566	572
Accrued contingent consideration		43
Operating leases rent expense		155	139	96
Settlement accrual		27
Compensatory Damages [Member]
Business Acquisition [Line Items]
Loss Contingency, Estimate of Possible Loss		6
Prejudgment Interest [Member]
Business Acquisition [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 10