Severance and Exit Costs 1 (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Accrued severance and exit costs activity
Accrued beginning balance	$ 49	$ 84
Accrued ending balance	24	53
Severance Charges
Accrued severance and exit costs activity
Accrued beginning balance	28	55
Expense	0	21
Change in estimate	(2)	(1)
Payments	(21)	(43)
Accretion and other	0	(2)
Accrued ending balance	5	30
Facility Exit Charges
Accrued severance and exit costs activity
Accrued beginning balance	21	29
Expense	0	0
Change in estimate	0	0
Payments	(3)	(5)
Accretion and other	1	(1)
Accrued ending balance	$ 19	$ 23