Severance and Exit Costs 1 (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accrued severance and exit costs activity
Accrued beginning balance	$ 49	$ 84
Accrued ending balance	22	43
Severance Charges
Accrued severance and exit costs activity
Accrued beginning balance	28	55
Expense	0	21
Change in estimate	(2)	(3)
Payments	(22)	(50)
Accretion and other	0	(1)
Accrued ending balance	4	22
Facility Exit Charges
Accrued severance and exit costs activity
Accrued beginning balance	21	29
Expense	0	0
Change in estimate	0	0
Payments	(3)	(7)
Accretion and other	0	(1)
Accrued ending balance	$ 18	$ 21