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			60
Net earnings common stockholders	$ 843			843
Dividends paid				(611)				(5)
Foreign currency translation	(182)					(183)
Pension and postretirement						58
Cash flow hedges	(56)					(56)
Purchases							(942)
Issued under stock plans							115
Net earnings								10
Other comprehensive income	(180)							1
Ending balance at Mar. 31, 2020	7,563	$ 477	453	24,431		(1,903)	(15,941)	46
Beginning balance at Dec. 31, 2019			447	24,220	0	(1,576)	(15,147)	38
Statement [Roll Forward]
Stock plans			6
Net earnings common stockholders	517			517
Dividends paid				(306)				0
Foreign currency translation	(281)					(282)
Pension and postretirement						30
Cash flow hedges	(75)					(75)
Purchases							(813)
Issued under stock plans							19
Net earnings								7
Other comprehensive income	(326)							1
Ending balance at Mar. 31, 2020	7,563	477	453	24,431		(1,903)	(15,941)	46
Statement [Roll Forward]
Common stockholders' equity	7,517
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			41
Net earnings common stockholders	1,006			1,006
Dividends paid				(606)				(5)
Foreign currency translation	168					169
Pension and postretirement						54
Cash flow hedges	32					32
Purchases							(82)
Issued under stock plans							112
Net earnings								14
Other comprehensive income	254							(1)
Ending balance at Mar. 31, 2021	9,180	477	511	25,354		(1,322)	(15,890)	50
Beginning balance at Dec. 31, 2020			499	25,096	$ 0	(1,330)	(15,847)	44
Statement [Roll Forward]
Stock plans			12
Net earnings common stockholders	561			561
Dividends paid				(303)				0
Foreign currency translation	(21)					(20)
Pension and postretirement						27
Cash flow hedges	1					1
Purchases							(69)
Issued under stock plans							26
Net earnings								7
Other comprehensive income	7							(1)
Ending balance at Mar. 31, 2021	9,180	$ 477	$ 511	$ 25,354		$ (1,322)	$ (15,890)	$ 50
Statement [Roll Forward]
Common stockholders' equity	$ 9,130