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Contingencies (Non-Engle Progeny Litigation) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2021 | May 31, 2023 | Feb. 28, 2023 | Sep. 30, 2022 | Feb. 28, 2021 | May 31, 2020 | Sep. 30, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision |  |  | $ 90,000,000 |  |  |  |  |  |
Non-Engle Progeny Smoking And Health Case, Deswert [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision | $ 1,000,000 |  |  |  |  |  |  |  |
Non-Engle Progeny Smoking And Health Case, Deswert [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  | $ 1,000,000 |  |  |  |  |
Loss contingency, fault allocation percentage |  |  |  | 50.00% |  |  |  |  |
Non-Engle Progeny Smoking And Health Case, Woodley [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  | $ 5,000,000 |  |  |  |
Punitive damages awarded |  |  |  |  | $ 0 |  |  |  |
Non-Engle Progeny Smoking And Health Case, Fontaine [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  | $ 8,000,000 |  |  |
Punitive damages awarded |  |  |  |  |  | $ 1,000,000,000 |  |  |
Non-Engle Progeny Smoking and Health Case, Greene [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision |  | $ 48,000,000 |  |  |  |  |  |  |
Non-Engle Progeny Smoking and Health Case, Greene [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  |  | $ 2,300,000 | $ 30,000,000 | $ 10,000,000

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