Accumulated Other Comprehensive Income (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension and post retirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of deferred actuarial losses, tax	$ (13)	$ (21)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclass of deferred cash flow hedging (losses), tax	0	0
Deferred cash flow hedging gains (losses), tax	$ (1)	$ 1