Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Accumulated other comprehensive income [Roll Forward]
Accumulated other comprehensive income (loss)	$ (1,056)	$ (52)	$ (1,056)	$ (52)	$ (575)
Foreign currency translation [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(560)	525	171	504
Other comprehensive income (loss)	190	37	(541)	50
Purchase of noncontrolling interest	0	0	0	8
Ending balance	(370)	562	(370)	562
Pension and post retirement [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(690)	(645)	(746)	(692)
Amortization of deferred actuarial losses into earnings	27	24	83	71
Ending balance	(663)	(621)	(663)	(621)
Cash Flow Hedges [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(23)	(8)	0	(1)
Deferred gains (losses) arising during the period	(6)	14	(35)	5
Reclassification of realized (gain) loss to sales and cost of sales	6	1	12	3
Ending balance	$ (23)	$ 7	$ (23)	$ 7