Severance and Exit Costs 2 (Details) (USD $) In Millions, unless otherwise specified													1 Months Ended	21 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2013 Severance [Member]	Mar. 31, 2012 Severance [Member]	Mar. 31, 2011 Severance [Member]	Mar. 31, 2010 Severance [Member]	Mar. 31, 2013 Facilities Abandonment [Member]	Mar. 31, 2012 Facilities Abandonment [Member]	Mar. 31, 2011 Facilities Abandonment [Member]	Mar. 31, 2010 Facilities Abandonment [Member]	Jul. 31, 2011 Fiscal 2012 Plan [Member] Employee	Mar. 31, 2013 Fiscal 2012 Plan [Member] Severance [Member]	Mar. 31, 2013 Plans and Actions Prior to Fiscal Year 2011 [Member] Severance [Member]	Mar. 31, 2012 Plans and Actions Prior to Fiscal Year 2011 [Member] Severance [Member]	Mar. 31, 2011 Plans and Actions Prior to Fiscal Year 2011 [Member] Severance [Member]	Mar. 31, 2013 Plans and Actions Prior to Fiscal Year 2011 [Member] Facilities Abandonment [Member]	Mar. 31, 2012 Plans and Actions Prior to Fiscal Year 2011 [Member] Facilities Abandonment [Member]	Mar. 31, 2011 Plans and Actions Prior to Fiscal Year 2011 [Member] Facilities Abandonment [Member]
Severance and Exit Costs (Textual) [Abstract]
Workforce reduction													400
Cumulative amount recognized														$ 39
Accrued balance	$ 39	$ 53	$ 55	$ 116	$ 16	$ 13	$ 8	$ 54	$ 23	$ 40	$ 47	$ 62			$ 2	$ 2	$ 8	$ 23	$ 40	$ 47