Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Accumulated other comprehensive income [Roll Forward]
Amortization of deferred actuarial losses into earnings net of tax: $(13), $(21), $(26) and $(42), respectively	$ 24	$ 37	$ 47	$ 74
Accumulated other comprehensive income (loss)	(128)	(708)	(128)	(708)	(189)
Foreign currency translation [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	521	546	504	466
Purchase of noncontrolling interest	8	0	8	0
Other comprehensive income	(4)	(126)	13	(46)
Ending balance	525	420	525	420
Pension and post retirement [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(669)	(1,176)	(692)	(1,213)
Amortization of deferred actuarial losses into earnings net of tax: $(13), $(21), $(26) and $(42), respectively	24	37	47	74
Ending balance	(645)	(1,139)	(645)	(1,139)
Cash Flow Hedges [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	2	13	(1)	16
Deferred gains (losses) arising during the period, net of tax: $6, $(1), $6 and $0, respectively	(11)	1	(8)	(1)
Reclassification of realized (gain) loss to sales and cost of sales, net of tax: $0, $3, $(1) and $3, respectively	1	(3)	1	(4)
Ending balance	$ (8)	$ 11	$ (8)	$ 11