Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Accumulated other comprehensive income [Roll Forward]
Beginning balance			$ 16,316
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Ending balance	$ 26,413	$ 16,287	26,413	$ 16,287
Accumulated other comprehensive income (loss)	(1,072)	(1,152)	(1,072)	(1,152)	$ (1,485)
Foreign currency translation, tax	3	(8)	35	(18)
Amortization of deferred actuarial losses, tax	6	(5)	13	(10)
Gains (losses) deferred during the period, tax	(2)	5	(11)	(4)
Reclassification of (gains) losses to sales and cost of sales, tax	1	4	3	10
Accumulated other comprehensive income (loss)
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(1,148)	(957)	(1,485)	(872)
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Ending balance	(1,072)	(1,152)	(1,072)	(1,152)
Foreign currency translation [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(918)	(760)	(1,265)	(629)
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Other comprehensive income (loss), foreign currency translation, net of tax of $3, $(8), $35 and $(18), respectively	(10)	(186)	337	(317)
Reclassified to gain on sale of business	95	0	95	0
Ending balance	(833)	(946)	(833)	(946)
Pension and post retirement [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(255)	(223)	(222)	(259)
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Amortization of deferred actuarial losses into earnings, net of tax of $6, $(5), $13 and $(10), respectively	(12)	18	(45)	54
Reclassified to gain on sale of business	22	0	22	0
Ending balance	(245)	(205)	(245)	(205)
Cash Flow Hedges [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	25	26	2	16
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Deferral of gains (losses) arising during the period, net of tax of $(2), $5, $(11) and $(4), respectively	7	(15)	34	14
Reclassification of realized gains (losses) to sales and cost of sales, net of tax of $1, $4, $3 and $10, respectively	(7)	(12)	(11)	(31)
Reclassified to gain on sale of business	(19)	0	(19)	0
Ending balance	$ 6	$ (1)	$ 6	$ (1)