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Contingencies (Non-Engle Progeny Litigation) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2021 | Feb. 28, 2021 | May 31, 2020 | Feb. 29, 2020 | Sep. 30, 2019 | Aug. 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision |  |  |  | $ 90,000,000 |  |  |  |  |
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 |  |  |  |  | $ 2,300,000 | $ 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
Damages awarded, value |  | $ 21,000,000 |  |  |  |  |  |  |
Loss contingency accrual, provision | $ 30,300,000 |  | $ 27,100,000 |  |  |  |  |  |

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