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Contingencies (Non-Engle Progeny Litigation) (Details) - USD ($) | May 31, 2020 | Feb. 29, 2020 | Sep. 30, 2019 | Aug. 31, 2019 | Oct. 31, 2017
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Non-Engle Progeny Smoking And Health Case, Principe [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Compensatory damages awarded |  | $ 11,000,000 |  |  |
Punitive damages awarded |  | $ 0 |  |  |
Non-Engle Progeny Smoking and Health Case, Greene [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Compensatory damages awarded | $ 30,000,000 |  | $ 10,000,000 |  |
Non-Engle Progeny Smoking and Health Case, Laramie [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Compensatory damages awarded |  |  |  | $ 11,000,000 |
Punitive damages awarded |  |  |  | $ 10,000,000 |
Non-Engle Progeny Smoking and Health Case, Gentile [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Compensatory damages awarded |  |  |  |  | $ 7,100,000
Non-Engle Progeny Smoking and Health Case, Gentile [Member] | PM USA [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Compensatory damages awarded |  |  |  |  | $ 5,300,000
Compensatory damages award, allocation percentage |  |  |  |  | 75.00%

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