Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, Beginning balance	$ 9,923	$ 8,447
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Stockholders' equity, Ending balance	16,316	9,923	$ 8,447
Accumulated other comprehensive income (loss)	(1,485)	(872)	(1,577)
Accumulated other comprehensive income (loss)
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, Beginning balance	(872)	(1,577)	(1,722)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Stockholders' equity, Ending balance	(1,485)	(872)	(1,577)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, Beginning balance	(629)	(711)	(794)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other comprehensive income (loss), net of taxes of $(62), $(5) and $29, respectively	(636)	82	83
Stockholders' equity, Ending balance	(1,265)	(629)	(711)
Cash flow hedges
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, Beginning balance	16	(2)	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Gains (Losses) deferred during the period, net of taxes of $(6), $(15) and $2, respectively	18	51	(9)
Reclassifications of realized (gains) losses to sales and cost of sales, net of taxes of $10, $11 and $(2) respectively	(32)	(33)	7
Stockholders' equity, Ending balance	2	16	(2)
Pension and postretirement
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, Beginning balance	(259)	(864)	(928)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Actuarial gains (losses) deferred during the period, net of taxes of $10, $(150), and $15, respectively	(33)	499	(49)
Amortization of deferred actuarial losses into earnings, net of taxes of $(21), $(34) and $(34), respectively	70	106	113
Stockholders' equity, Ending balance	$ (222)	$ (259)	$ (864)