Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified				17 Months Ended	35 Months Ended	17 Months Ended			17 Months Ended				35 Months Ended	36 Months Ended	69 Months Ended			36 Months Ended					6 Months Ended	36 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2013 Fiscal 2013 Restructuring	Aug. 31, 2016 Fiscal 2013 Restructuring	Sep. 30, 2013 Fiscal 2013 Restructuring Workforce	Mar. 31, 2013 Fiscal 2013 Restructuring Workforce	Mar. 31, 2012 Fiscal 2013 Restructuring Workforce	Sep. 30, 2013 Fiscal 2013 Restructuring License Termination Cost	Sep. 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	Sep. 30, 2013 Fiscal 2011 Restructuring	Jun. 30, 2016 Fiscal 2011 Restructuring	Jun. 30, 2016 Fiscal 2011 Restructuring June 2016	Sep. 30, 2013 Fiscal 2011 Restructuring June 2016	Sep. 30, 2013 Fiscal 2011 Restructuring Workforce	Jun. 30, 2016 Fiscal 2011 Restructuring Workforce June 2016	Sep. 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	Sep. 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	Sep. 30, 2016 Other Restructurings and Reorganization	Sep. 30, 2013 Other Restructurings and Reorganization Expected By September 2016	Sep. 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				$ 23		$ 10			$ 9	$ 4				$ 172				$ 12		$ 129		$ 31
Restructuring charges													2						12		168		2	8
Restructuring and related activities expected completion date					Aug. 31, 2016										Jun. 30, 2016										Sep. 30, 2016
Restructuring reserve and accrual	58	62	78			0	0	0		1	2	0					54									2	2	2	3
Expected restructuring charges, Minimum																180
Expected restructuring charges, Maximum																$ 185