Retirement Benefits (Assumption in calculating projected benefit obligation) (Details)	Sep. 30, 2015	Sep. 30, 2014
US [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%	4.30%
Rate of compensation increase	3.50%	3.50%
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.40%	3.60%
Rate of compensation increase	3.50%	3.60%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.40%	2.60%