Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Foreign currency translation adjustment, tax provision (benefit)		$ 2	$ 1	$ (12)
Unrealized holding gains arising during the period, tax provision	1		1
Pension and other postretirement benefit liability adjustments arising during the period, tax provision		6		6
Amortization of net loss and prior service credit included in net periodic pension cost, tax provision				$ 2