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, 2018			$ 348	$ 23,072	$ (1,015)	$ (13,935)	$ 43
Statement [Roll Forward]
Stock plans			45
Net earnings common stockholders	$ 2,306			2,306
Dividends paid (per share)	$ 1.96
Dividends paid (per share: 2021, $2.02; 2020, $2.00; 2019, $1.96)				(1,209)			(25)
Adoption of new accounting standards				30
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]
Common stockholders' equity	8,233
Stock plans			77
Net earnings common stockholders	$ 1,965			1,965
Dividends paid (per share)	$ 2.00
Dividends paid (per share: 2021, $2.02; 2020, $2.00; 2019, $1.96)				(1,209)			(25)
Adoption of new accounting standards				0
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]
Common stockholders' equity	8,405
Stock plans			52
Net earnings common stockholders	$ 2,303
Dividends paid (per share)	$ 2.02
Dividends paid (per share: 2021, $2.02; 2020, $2.00; 2019, $1.96)				(1,210)			(25)
Adoption of new accounting standards				(1)
Foreign currency translation	$ 81				82
Pension and postretirement	605				605
Cash flow hedges	18				18
Purchases						(500)
Issued under stock plans						129
Net earnings							24
Other comprehensive income (loss)	704						(1)
Stockholders' equity, Ending balance at Sep. 30, 2021	9,923	$ 477	$ 522	$ 26,047	$ (872)	$ (16,291)	$ 40
Statement [Roll Forward]
Common stockholders' equity	$ 9,883