Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Accumulated other comprehensive income [Roll Forward]
Accumulated other comprehensive income (loss)	$ (1,738)	$ (875)	$ (1,617)
Foreign currency translation [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(622)	171
Other comprehensive income (loss)	(153)	(304)
Ending balance	(775)	(133)
Pension and post retirement [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(952)	(746)
Amortization of deferred actuarial losses into earnings	26	28
Ending balance	(926)	(718)
Cash Flow Hedges [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(43)	0
Deferral of gains (losses) arising during the period	(3)	(26)
Reclassification of realized (gains) losses to sales and cost of sales	9	2
Ending balance	$ (37)	$ (24)