Benefit Plans - Change in Benefit Obligation, Change in Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Amounts recognized in the Consolidated Balance Sheets at September 30:
Long-term Employee Benefit Obligations	$ (902)	$ (1,228)
Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning obligation	3,889	3,953
Service cost	134	150	$ 153
Interest cost	77	71	84
Plan amendments	(1)	30
Benefits paid	(64)	(156)
Impact of Embecta spin-off	(7)	0
Actuarial gain	(1,007)	(69)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	246
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement		(49)
Other, includes translation	143	(19)
Ending obligation	2,634	3,889	3,953
Change in fair value of plan assets:
Beginning fair value	3,222	3,045
Actual return on plan assets	(740)	317
Employer contribution	198	66
Benefits paid	(64)	(156)
Impact of Embecta spin-off	(6)	0
Settlements	(241)	(55)
Other, includes translation	(127)	5
Ending fair value	2,242	3,222	$ 3,045
Funded Status at September 30:
Unfunded benefit obligation	(392)	(667)
Amounts recognized in the Consolidated Balance Sheets at September 30:
Other Assets	70	29
Salaries, wages and related items	(15)	(29)
Long-term Employee Benefit Obligations	(447)	(667)
Net amount recognized	(392)	(667)
Amounts recognized in Accumulated other comprehensive income (loss) before income taxes at September 30:
Prior service credit	24	41
Net actuarial loss	(728)	(972)
Net amount recognized	$ (704)	$ (931)