The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Finite-Lived Intangible Assets, Net [Abstract]
Intangibles amortization expense	$ 15	$ 20	$ 32	$ 40
Expected future amortization expense [Abstract]
2025 (includes six months actual and six months estimated)	61		61
2026	57		57
2027	35		35
2028	33		33
2029	$ 26		$ 26
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 and Supplier Relationships [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 and Supplier Relationships [Member]
Intangible Assets, Net [Abstract]
Useful life (in years)	24 years		24 years