Royalties And Licenses (Narrative) (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended			3 Months Ended	9 Months Ended
	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2011 Commitment to pay content licensors, independent software developers and co-publishing and/or distribution affiliates Developer Performance Obligation Commitment [Member]	Dec. 31, 2010 Fiscal 2011 Restructuring [Member]	Dec. 31, 2011 Fiscal 2011 Restructuring [Member]	Dec. 31, 2010 Fiscal 2011 Restructuring [Member] Amended Licensing Agreements [Member]	Dec. 31, 2011 Fiscal 2011 Restructuring [Member] Amended Licensing Agreements [Member]	Dec. 31, 2010 Fiscal 2011 Restructuring [Member] Amended Licensing Agreements [Member]	Dec. 31, 2010 Asset Impairment [Member] Fiscal 2011 Restructuring [Member] Amended Licensing Agreements [Member]
Royalties And Licenses [Line Items]
Loss on unrecognized minimum royalty				$ 75		$ 75	$ 14	$ 85	$ 27
Committed to pay			896
Restructuring accruals included in royalty-related liabilities	$ 223	$ 197			$ 80