Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Millions		12 Months Ended
	Oct. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance		$ (2,088)	$ (2,548)	$ (2,283)
Other comprehensive loss before reclassifications, net of taxes		306	383	(338)
Amounts reclassified into income, net of taxes		43	77	74
Spin-off of Embecta (See Note 2)		251
Accumulated other comprehensive (loss) income, ending balance		(1,488)	(2,088)	(2,548)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance		(1,292)	(1,416)	(1,256)
Other comprehensive loss before reclassifications, net of taxes		54	124	(161)
Amounts reclassified into income, net of taxes		0	0	0
Spin-off of Embecta (See Note 2)		251
Accumulated other comprehensive (loss) income, ending balance		(987)	(1,292)	(1,416)
Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance		(784)	(1,040)	(1,005)
Other comprehensive loss before reclassifications, net of taxes	$ 24	169	187	(101)
Amounts reclassified into income, net of taxes		41	68	66
Spin-off of Embecta (See Note 2)		0
Accumulated other comprehensive (loss) income, ending balance		(574)	(784)	(1,040)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance		(10)	(91)	(23)
Other comprehensive loss before reclassifications, net of taxes		83	72	(76)
Amounts reclassified into income, net of taxes		2	9	8
Spin-off of Embecta (See Note 2)		0
Accumulated other comprehensive (loss) income, ending balance		$ 75	$ (10)	$ (91)