Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified				14 Months Ended				14 Months Ended				38 Months Ended	33 Months Ended	36 Months Ended		33 Months Ended	36 Months Ended	33 Months Ended	36 Months Ended	33 Months Ended	9 Months Ended	36 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2013 Fiscal 2013 Restructuring	Jun. 30, 2013 Fiscal 2013 Restructuring Workforce	Mar. 31, 2013 Fiscal 2013 Restructuring Workforce	Mar. 31, 2012 Fiscal 2013 Restructuring Workforce	Jun. 30, 2013 Fiscal 2013 Restructuring License Termination Cost	Jun. 30, 2013 Fiscal 2013 Restructuring Facilities-Related	Mar. 31, 2013 Fiscal 2013 Restructuring Facilities-Related	Mar. 31, 2012 Fiscal 2013 Restructuring Facilities-Related	Aug. 31, 2016 Fiscal 2013 Restructuring License and Lease Termination Costs August 2016	Jun. 30, 2013 Fiscal 2011 Restructuring	Jun. 30, 2016 Fiscal 2011 Restructuring June 2016	Jun. 30, 2013 Fiscal 2011 Restructuring June 2016	Jun. 30, 2013 Fiscal 2011 Restructuring Workforce	Jun. 30, 2016 Fiscal 2011 Restructuring Workforce June 2016	Jun. 30, 2013 Fiscal 2011 Restructuring Amended Licensing Agreements And Other Asset Impairment	Jun. 30, 2016 Fiscal 2011 Restructuring Amended Licensing Agreements And Other Asset Impairment June 2016	Jun. 30, 2013 Fiscal 2011 Restructuring Developer Commitments	Mar. 31, 2014 Fiscal 2011 Restructuring Accretion Of Interest	Jun. 30, 2016 Fiscal 2011 Restructuring Accretion Of Interest June 2016	Jun. 30, 2013 Other Restructurings and Reorganization Expected By September 2016	Jun. 30, 2013 Other Restructurings and Reorganization Facilities-Related	Mar. 31, 2013 Other Restructurings and Reorganization Facilities-Related	Mar. 31, 2012 Other Restructurings and Reorganization Facilities-Related
Restructuring And Other Charges
Restructuring incurred charges				$ 22	$ 10			$ 9	$ 3				$ 175			$ 12		$ 132		$ 31
Restructuring charges												2					12		170		3	7
Restructuring and Related Activities, Completion Date				Mar. 31, 2013									Mar. 31, 2011
Restructuring reserve and accrual	61	62	78		0	0	0		1	2	0				57								2	2	2	3
Expected restructuring charges, Minimum														180
Expected restructuring charges, Maximum														$ 185