Consolidated Statements Of Equity - USD ($) $ in Millions	Total	Common stock [Member]	Additional paid-in-capital [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss) [Member]	Treasury stock [Member]	Noncontrolling interests in subsidiaries [Member]
Stockholders' equity, Beginning balance at Sep. 30, 2013			$ 352	$ 18,930	$ (189)	$ (8,985)	$ 133
Statement [Roll Forward]
Stock plans			160
Purchase of noncontrolling interests			(351)
Net earnings common stockholders	$ 2,147			2,147
Dividends paid (per share: 2016, $1.90; 2015, $1.88; 2014, $1.72)				(1,210)			(18)
Foreign currency translation	(344)				(333)
Pension and postretirement	(54)				(54)
Cash flow hedges	1				1
Purchases						(971)
Issued under stock plans						145
Net earnings							(37)
Other comprehensive income (loss)	(397)						(3)
Purchase of noncontrolling interests							(101)
Stockholders' equity, Ending balance at Sep. 30, 2014	10,167	$ 477	161	19,867	(575)	(9,811)	48
Statement [Roll Forward]
Common stockholders' equity	10,119
Stock plans			31
Purchase of noncontrolling interests			(22)
Net earnings common stockholders	2,710			2,710
Dividends paid (per share: 2016, $1.90; 2015, $1.88; 2014, $1.72)				(1,269)			(23)
Foreign currency translation	(794)				(793)
Pension and postretirement	(206)				(206)
Cash flow hedges	(43)				(43)
Purchases						(2,487)
Issued under stock plans						41
Net earnings							(23)
Other comprehensive income (loss)	(1,043)						(1)
Purchase of noncontrolling interests							0
Stockholders' equity, Ending balance at Sep. 30, 2015	8,128	477	170	21,308	(1,617)	(12,257)	47
Statement [Roll Forward]
Common stockholders' equity	8,081
Stock plans			35
Purchase of noncontrolling interests			0
Net earnings common stockholders	1,635			1,635
Dividends paid (per share: 2016, $1.90; 2015, $1.88; 2014, $1.72)				(1,227)			(28)
Foreign currency translation	(188)				(190)
Pension and postretirement	(210)				(210)
Cash flow hedges	18				18
Purchases						(601)
Issued under stock plans						27
Net earnings							(29)
Other comprehensive income (loss)	(380)						2
Purchase of noncontrolling interests							0
Stockholders' equity, Ending balance at Sep. 30, 2016	7,618	$ 477	$ 205	$ 21,716	$ (1,999)	$ (12,831)	$ 50
Statement [Roll Forward]
Common stockholders' equity	$ 7,568