Severance and Exit Costs 2 (Details) $ in Millions	6 Months Ended	11 Months Ended
	Jun. 30, 2015 Employee	Mar. 31, 2014 USD ($) Employee	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Accrued balance		$ 84	$ 24	$ 49	$ 53
Severance
Restructuring Cost and Reserve [Line Items]
Accrued balance		$ 55	5	28	$ 30
Fiscal 2015 Severance Actions
Restructuring Cost and Reserve [Line Items]
Number of employees terminated | Employee	690
Fiscal 2015 Severance Actions | Severance
Restructuring Cost and Reserve [Line Items]
Expected cost				$ 40
Fiscal 2014 Plan
Restructuring Cost and Reserve [Line Items]
Number of employees terminated | Employee		1,900
Cost incurred to date			188
Plans and Actions Prior to Fiscal 2015 Severance Actions | Severance
Restructuring Cost and Reserve [Line Items]
Accrued balance			$ 2