Accumulated Other Comprehensive Income (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension and post retirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of deferred actuarial losses, tax	$ (13)	$ (21)	$ (39)	$ (63)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred cash flow hedging gains (losses), tax	(8)	16	(3)	16
Reclass of deferred cash flow hedging (losses), tax	$ (1)	$ 0	$ (1)	$ 3