Consolidated Statement of Equity Statement - USD ($) $ in Millions	Total	Common stock	Additional paid-in-capital	Retained earnings	Retained earnings Cumulative effect of adoption of accounting standard	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests in subsidiaries
Beginning balance at Sep. 30, 2019			$ 393	$ 24,199	$ 0	$ (1,722)	$ (15,114)	$ 40
Statement [Roll Forward]
Stock plans			66
Net earnings common stockholders	$ 1,242			1,242
Dividends paid				(910)				(11)
Foreign currency translation	(48)					(48)
Pension and postretirement						87
Cash flow hedges	(16)					(16)
Purchases							(942)
Issued under stock plans							119
Net earnings								18
Other comprehensive income	23							0
Ending balance at Jun. 30, 2020	7,878	$ 477	459	24,531		(1,699)	(15,937)	47
Beginning balance at Mar. 31, 2020			453	24,431	0	(1,903)	(15,941)	46
Statement [Roll Forward]
Stock plans			6
Net earnings common stockholders	399			399
Dividends paid				(299)				(6)
Foreign currency translation	134					135
Pension and postretirement						29
Cash flow hedges	40					40
Purchases							0
Issued under stock plans							4
Net earnings								8
Other comprehensive income	203							(1)
Ending balance at Jun. 30, 2020	7,878	477	459	24,531		(1,699)	(15,937)	47
Statement [Roll Forward]
Common stockholders' equity	7,831
Common stockholders' equity	8,405
Beginning balance at Sep. 30, 2020	8,447		470	24,955	(1)	(1,577)	(15,920)	42
Statement [Roll Forward]
Stock plans			48
Net earnings common stockholders	1,633			1,633
Dividends paid				(909)				(14)
Foreign currency translation	163					163
Pension and postretirement						81
Cash flow hedges	26					26
Purchases							(275)
Issued under stock plans							120
Net earnings								20
Other comprehensive income	270							0
Ending balance at Jun. 30, 2021	9,339	477	518	25,678		(1,307)	(16,075)	48
Beginning balance at Mar. 31, 2021			511	25,354	$ 0	(1,322)	(15,890)	50
Statement [Roll Forward]
Stock plans			7
Net earnings common stockholders	627			627
Dividends paid				(303)				(9)
Foreign currency translation	(5)					(6)
Pension and postretirement						27
Cash flow hedges	(6)					(6)
Purchases							(193)
Issued under stock plans							8
Net earnings								6
Other comprehensive income	16							1
Ending balance at Jun. 30, 2021	9,339	$ 477	$ 518	$ 25,678		$ (1,307)	$ (16,075)	$ 48
Statement [Roll Forward]
Common stockholders' equity	$ 9,291