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Divestitures - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of business	$ 16			$ 0	$ 16
Pre-tax gain		$ 0	$ 18	2	(165)
Land and Building [Member] | Corporate [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of business			11	4	11
Pre-tax gain			11	2	11
Sale of properties with net book value	$ 0	$ 2	0	$ 2	0
Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge			0		183
Pre-tax gain			$ 8		8
Discontinued Operations, Held-for-sale [Member] | Goodwill [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					1
Discontinued Operations, Held-for-sale [Member] | Other Intangible Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					134
Discontinued Operations, Held-for-sale [Member] | Property, Plant and Equipment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					33
Discontinued Operations, Held-for-sale [Member] | Operating Lease Assets Net [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					14
Discontinued Operations, Held-for-sale [Member] | Other Current Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					$ 1

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of.

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