Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension and post retirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of deferred actuarial losses, tax	$ (16)	$ (13)	$ (46)	$ (39)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred cash flow hedging gains (losses), tax	3	(8)	20	(3)
Reclass of deferred cash flow hedging (losses), tax	$ (3)	$ (1)	$ (7)	$ (1)