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Contingencies (Other Disputes Under the State Settlement Agreements) (Details) - PM USA [Member] - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2024
Loss Contingencies [Line Items] |  |  |
Payments for legal settlements |  | $ 7 |
Other Disputes Under the State Settlement Agreements [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Litigation settlement | $ 31 |  |
Cost of Sales [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Payments for legal settlements |  |  | $ 5
Interest Expense [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Payments for legal settlements |  |  | $ 2

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