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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Finite-Lived Intangible Assets, Net [Abstract]
Other intangibles amortization expense	$ 15	$ 15	$ 30	$ 32
Expected future amortization expense [Abstract]
2026 (includes six months actual and six months estimated)	60		60
2027	37		37
2028	34		34
2029	27		27
2030	19		19
Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Impairment charges	$ 0		$ 0
Minimum [Member] \| Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	3 years		3 years
Minimum [Member] \| Intellectual Property [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	3 years		3 years
Minimum [Member] \| Customer Lists [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	10 years		10 years
Maximum [Member] \| Trademarks and Trade Names [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	20 years		20 years
Maximum [Member] \| Intellectual Property [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	20 years		20 years
Maximum [Member] \| Customer Lists [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	24 years		24 years