Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	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	16,714	$ 10,288
Accumulated other comprehensive income (loss)	(1,255)	(922)	$ (1,485)
Accumulated other comprehensive income (loss)
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(1,485)	(872)
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Ending balance	(1,255)	(922)
Foreign currency translation [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(1,265)	(629)
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Other comprehensive income (loss), foreign currency translation, net of tax of $28 and $(10), respectively	236	(72)
Ending balance	(1,029)	(701)
Pension and post retirement [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	(222)	(259)
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Amortization of deferred actuarial losses into earnings, net of tax of $4 and $(5), respectively	(16)	18
Ending balance	(238)	(241)
Cash Flow Hedges [Member]
Accumulated other comprehensive income [Roll Forward]
Beginning balance	2	16
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Deferral of gains (losses) arising during the period, net of tax of $(3) and $(4), respectively	9	12
Reclassification of realized gains (losses) to sales and cost of sales, net of tax of $0 and $2, respectively	1	(8)
Ending balance	$ 12	$ 20