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, 2016			$ 205	$ 21,716	$ (1,999)	$ (12,831)	$ 50
Statement [Roll Forward]
Stock plans			92
Net earnings common stockholders	$ 1,518			1,518
Dividends paid (per share: 2019, $1.96; 2018, $1.94; 2017, $1.92)				(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: 2019, $1.96; 2018, $1.94; 2017, $1.92)				(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
Stock plans			45
Net earnings common stockholders	2,306			2,306
Dividends paid (per share: 2019, $1.96; 2018, $1.94; 2017, $1.92)				(1,209)			(25)
Foreign currency translation	(194)				(194)
Pension and postretirement	(508)				(508)
Cash flow hedges	(5)				(5)
Purchases						(1,250)
Issued under stock plans						71
Net earnings							22
Other comprehensive income (loss)	(707)						0
Stockholders' equity, Ending balance at Sep. 30, 2019	8,273	$ 477	$ 393	24,199	$ (1,722)	$ (15,114)	$ 40
Statement [Roll Forward]
Adoption of accounting standard updates				$ 30
Common stockholders' equity	$ 8,233