Severance and Exit Costs 2 (Details) (USD $) In Millions, unless otherwise specified													17 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2014 Severance [Member]	Mar. 31, 2014 Severance [Member]	Sep. 30, 2013 Severance [Member]	Mar. 31, 2013 Severance [Member]	Sep. 30, 2014 Facility Exit [Member]	Mar. 31, 2014 Facility Exit [Member]	Sep. 30, 2013 Facility Exit [Member]	Mar. 31, 2013 Facility Exit [Member]	Sep. 30, 2014 Fiscal 2014 Plan [Member] Employee	Sep. 30, 2014 Fiscal 2014 Plan [Member] Severance [Member]	Sep. 30, 2014 Fiscal 2014 Plan [Member] Facility Exit [Member]	Sep. 30, 2013 Plans and Actions Prior to Fiscal 2014 Plan [Member] Severance [Member]	Sep. 30, 2014 Plans and Actions Prior to Fiscal 2014 Plan [Member] Facility Exit [Member]	Sep. 30, 2013 Plans and Actions Prior to Fiscal 2014 Plan [Member] Facility Exit [Member]
Restructuring Cost and Reserve [Line Items]
Workforce rebalancing (number of employees)													1,900
Cost incurred to date														$ 170	$ 22
Expected cost													195	173	22
Accrued balance	$ 53	$ 84	$ 85	$ 39	$ 30	$ 55	$ 52	$ 16	$ 23	$ 29	$ 33	$ 23				$ 7	$ 11	$ 15