Consolidated Statement of Equity Statement - USD ($) $ in Millions	Total	Common stock	Additional paid-in-capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests in subsidiaries
Beginning balance at Sep. 30, 2018			$ 348	$ 23,072	$ (1,015)	$ (13,935)	$ 43
Statement [Roll Forward]
Stock plans			39
Net earnings common stockholders	$ 1,589			1,589
Dividends paid				(909)			(10)
Foreign currency translation	(40)				(41)
Pension and postretirement					38
Cash flow hedges	2				2
Purchases						(1,000)
Issued under stock plans						65
Net earnings							15
Other comprehensive income	0						1
Ending balance at Jun. 30, 2019	8,804	$ 477	387	23,777	(1,016)	(14,870)	49
Beginning balance at Mar. 31, 2019			380	23,475	(928)	(14,878)	46
Statement [Roll Forward]
Stock plans			7
Net earnings common stockholders	604			604
Dividends paid				(302)			(5)
Foreign currency translation	(93)				(93)
Pension and postretirement					13
Cash flow hedges	(8)				(8)
Purchases						0
Issued under stock plans						8
Net earnings							8
Other comprehensive income	(88)						0
Ending balance at Jun. 30, 2019	8,804	477	387	23,777	(1,016)	(14,870)	49
Statement [Roll Forward]
Common stockholders' equity	8,755
Common stockholders' equity	8,233
Beginning balance at Sep. 30, 2019	8,273		393	24,199	(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	(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