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, 2017			$ 297	$ 21,995	$ (1,019)	$ (13,032)	$ 52
Statement [Roll Forward]
Stock plans			51
Net earnings common stockholders	$ 2,203			2,203
Dividends paid (per share: 2020, $2.00; 2019, $1.96; 2018, $1.94)				(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: 2020, $2.00; 2019, $1.96; 2018, $1.94)				(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
Stock plans			77
Net earnings common stockholders	1,965
Dividends paid (per share: 2020, $2.00; 2019, $1.96; 2018, $1.94)				(1,209)			(25)
Foreign currency translation	85				83
Pension and postretirement	64				64
Cash flow hedges	(2)				(2)
Purchases						(942)
Issued under stock plans						136
Net earnings							25
Other comprehensive income (loss)	147						2
Stockholders' equity, Ending balance at Sep. 30, 2020	8,447	$ 477	$ 470	24,955	$ (1,577)	$ (15,920)	$ 42
Statement [Roll Forward]
Adoption of accounting standard updates				$ 0
Common stockholders' equity	$ 8,405