Contingencies (Engle Progeny Cases Trial Results - Pending and Concluded) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2026	Jun. 30, 2024
Engle Progeny Cases, Garcia [Member] \| Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded	$ 50.0	$ 2.0
Engle Progeny Cases, Garcia [Member] \| Pending Litigation [Member] \| United States [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded	(38.0)
Engle Progeny Cases, Garcia [Member] \| Pending Litigation [Member] \| Philip Morris USA
Loss Contingencies [Line Items]
Punitive damages awarded	0.0	$ 10.0
Engle Progeny Cases, Chacon [Member] \| Settled Litigation [Member]
Loss Contingencies [Line Items]
Payment Amount for Damages (if any)	1.0
Engle Progeny Cases, McCall [Member] \| Settled Litigation [Member]
Loss Contingencies [Line Items]
Payment Amount for Damages (if any)	$ 1.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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