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Contingencies (Engle Progeny Cases Trial Results - Pending and Concluded) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Oct. 31, 2023 | Jan. 31, 2023 | Sep. 30, 2022 | Apr. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2019 | Sep. 30, 2018 | Jul. 31, 2018 | Sep. 30, 2015
Engle Progeny Cases, Chacon [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  | $ 1 |  |  |  |  |  |  |  |
Engle Progeny Cases, Chacon [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Punitive damages awarded |  | $ 1 |  |  |  |  |  |  |  |
Engle Progeny Cases, Hoffman [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  | $ 5 |  |  |  |  |  |  |
Engle Progeny Cases, Hoffman [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  | 3 |  |  |  |  |  |  |
Punitive damages awarded |  |  | $ 0 |  |  |  |  |  |  |
Engle Progeny Cases, Levine [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  | $ 1 |  |  |  |  |  |
Engle Progeny Cases, Levine [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Punitive damages awarded |  |  |  | $ 0 |  |  |  |  |  |
Engle Progeny Cases, Schertzer [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  | $ 3 |  |  |  |  |
Engle Progeny Cases, Schertzer [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Punitive damages awarded |  |  |  |  | $ 0 |  |  |  |  |
Engle Progeny Cases, Lipp [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  | $ 15 |  |  |  |
Engle Progeny Cases, Lipp [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Punitive damages awarded |  |  |  |  |  | $ 28 |  |  |  |
Engle Progeny Cases, McCall [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  |  | $ 1 |  |  |
Engle Progeny Cases, McCall [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  |  | 1 |  |  |
Punitive damages awarded |  |  |  |  |  |  | $ 1 |  |  |
Engle Progeny Cases, Chadwell [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  |  |  | $ 2 |  |
Engle Progeny Cases, Chadwell [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Punitive damages awarded |  |  |  |  |  |  |  | $ 0 |  |
Engle Progeny Cases, Kaplan [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  |  |  |  | $ 2 |
Engle Progeny Cases, Kaplan [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Punitive damages awarded |  |  |  |  |  |  |  |  | $ 0 |
Engle Progeny Cases, Cooper [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  |  |  |  |  | $ 5
Engle Progeny Cases, Cooper [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Compensatory damages awarded |  |  |  |  |  |  |  |  |  | 1
Punitive damages awarded |  |  |  |  |  |  |  |  |  | $ 0
Engle Progeny Cases, Duignan [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Damages awarded, value | $ 1 |  |  |  |  |  |  |  |  |
Engle Progeny Cases, Garcia [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Damages awarded, value | 3 |  |  |  |  |  |  |  |  |
Engle Progeny Cases, Holliman [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Damages awarded, value | 3 |  |  |  |  |  |  |  |  |
Engle Progeny Cases, Ferraiuolo | Settled Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Damages awarded, value | $ 1 |  |  |  |  |  |  |  |  |

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