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, 2015			$ 170	$ 21,308	$ (1,617)	$ (12,257)	$ 47
Statement [Roll Forward]
Stock plans			35
Net earnings common stockholders	$ 1,635			1,635
Dividends paid (per share: 2018, $1.94; 2017, $1.92; 2016, $1.90)				(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]
Adoption of accounting standard updates				0
Common stockholders' equity	7,568
Stock plans			92
Net earnings common stockholders	1,518			1,518
Dividends paid (per share: 2018, $1.94; 2017, $1.92; 2016, $1.90)				(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]
Adoption of accounting standard updates				0
Common stockholders' equity	8,718
Stock plans			51
Net earnings common stockholders	2,203			2,203
Dividends paid (per share: 2018, $1.94; 2017, $1.92; 2016, $1.90)				(1,229)			(30)
Foreign currency translation	(231)				(231)
Pension and postretirement	242				242
Cash flow hedges	(7)				(7)
Purchases						(1,000)
Issued under stock plans						97
Net earnings							21
Other comprehensive income (loss)	4						0
Stockholders' equity, Ending balance at Sep. 30, 2018	8,990	$ 477	$ 348	23,072	$ (1,015)	$ (13,935)	$ 43
Statement [Roll Forward]
Adoption of accounting standard updates				$ 103
Common stockholders' equity	$ 8,947