Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended						3 Months Ended				3 Months Ended						3 Months Ended	21 Months Ended	3 Months Ended		3 Months Ended	21 Months Ended			3 Months Ended				3 Months Ended	21 Months Ended	3 Months Ended	21 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Mar. 31, 2011	Jun. 30, 2012 Fiscal 2013 Restructuring	Jun. 30, 2012 Fiscal 2013 Restructuring Expected by March 31, 2013	Jun. 30, 2012 Fiscal 2013 Restructuring May 2016	Jun. 30, 2012 Fiscal 2013 Restructuring Facilities-Related	Mar. 31, 2012 Fiscal 2013 Restructuring Facilities-Related	Mar. 31, 2011 Fiscal 2013 Restructuring Facilities-Related	Jun. 30, 2012 Fiscal 2013 Restructuring Facilities-Related Expected by March 31, 2013	Jun. 30, 2012 Fiscal 2013 Restructuring Workforce	Mar. 31, 2012 Fiscal 2013 Restructuring Workforce	Mar. 31, 2011 Fiscal 2013 Restructuring Workforce	Jun. 30, 2012 Fiscal 2013 Restructuring Workforce Expected by March 31, 2013	Jun. 30, 2012 Fiscal 2013 Restructuring License Termination Cost	Jun. 30, 2012 Fiscal 2013 Restructuring License Termination Cost Expected by March 31, 2013	Jun. 30, 2012 Fiscal 2013 Restructuring Other Reorganizational Cost	Mar. 31, 2012 Fiscal 2013 Restructuring Other Reorganizational Cost	Mar. 31, 2011 Fiscal 2013 Restructuring Other Reorganizational Cost	Jun. 30, 2012 Fiscal 2013 Restructuring Other Reorganizational Cost May 2016	Jun. 30, 2012 Fiscal 2011 Restructuring	Jun. 30, 2012 Fiscal 2011 Restructuring June 2016	Jun. 30, 2012 Fiscal 2011 Restructuring Expected By June 2016	Jun. 30, 2012 Fiscal 2011 Restructuring Expected By March 31, 2012	Jun. 30, 2012 Fiscal 2011 Restructuring Workforce	Mar. 31, 2012 Fiscal 2011 Restructuring Workforce	Mar. 31, 2011 Fiscal 2011 Restructuring Workforce	Jun. 30, 2012 Fiscal 2011 Restructuring Workforce Expected By June 2016	Jun. 30, 2012 Fiscal 2011 Restructuring Other Reorganizational Cost	Mar. 31, 2012 Fiscal 2011 Restructuring Other Reorganizational Cost	Mar. 31, 2011 Fiscal 2011 Restructuring Other Reorganizational Cost	Jun. 30, 2012 Fiscal 2011 Restructuring Amended Licensing Agreements Accretion Of Interest June 2016	Jun. 30, 2012 Fiscal 2011 Restructuring Amended Licensing Agreements And Other Asset Impairment Asset Impairment	Jun. 30, 2012 Fiscal 2011 Restructuring Amended Licensing And Developer Agreements Expected By June 2016	Jun. 30, 2012 Fiscal 2011 Restructuring Amended Developer Agreements	Jun. 30, 2012 Other Restructurings and Reorganization Expected By September 2013	Jun. 30, 2012 Other Restructurings and Reorganization Facilities-Related	Mar. 31, 2012 Other Restructurings and Reorganization Facilities-Related	Mar. 31, 2011 Other Restructurings and Reorganization Facilities-Related	Jun. 30, 2012 Other Restructurings and Reorganization Other Reorganizational Cost	Mar. 31, 2012 Other Restructurings and Reorganization Other Reorganizational Cost	Mar. 31, 2011 Other Restructurings and Reorganization Other Reorganizational Cost
Restructuring And Other Charges
Restructuring incurred charges				$ 26			$ 1				$ 16				$ 9						$ 169				$ 12								$ 126		$ 31
Expected restructuring charges, Minimum					31					6				16								180
Expected restructuring charges, Maximum					35					8				18								185
Restructuring And Related Cost, Expected Cash Expenditures						22
Restructuring reserve and accrual	90	78	117				1	0	0		10	0	0				1	0	0				75		0	0	3		75	75	101					3	3	3	8	0	0	5
Restructuring charges																$ 9				$ 4				$ 4				$ 12				$ 11		$ 168