Consolidated Statements Of Equity - USD ($) $ in Millions	Total	Common stock	Additional paid-in-capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests in subsidiaries
Stockholders' equity, Beginning balance at Sep. 30, 2014			$ 161	$ 19,867	$ (575)	$ (9,811)	$ 48
Statement [Roll Forward]
Stock plans			31
Purchase of noncontrolling interests			(22)
Net earnings common stockholders	$ 2,710			2,710
Dividends paid (per share: 2017, $1.92; 2016, $1.90; 2015, $1.88)				(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)
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: 2017, $1.92; 2016, $1.90; 2015, $1.88)				(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
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
Stock plans			92
Purchase of noncontrolling interests			0
Net earnings common stockholders	1,518			1,518
Dividends paid (per share: 2017, $1.92; 2016, $1.90; 2015, $1.88)				(1,239)			(28)
Foreign currency translation	441				443
Pension and postretirement	500				500
Cash flow hedges	37				37
Purchases						(400)
Issued under stock plans						199
Net earnings							32
Other comprehensive income (loss)	978						(2)
Stockholders' equity, Ending balance at Sep. 30, 2017	8,770	$ 477	$ 297	$ 21,995	$ (1,019)	$ (13,032)	$ 52
Statement [Roll Forward]
Common stockholders' equity	$ 8,718