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Contingencies (Schedule of Pending Cases) (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2024 claim case lawsuit | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) | May 31, 2023 lawsuit | Apr. 24, 2023 claim | Dec. 31, 2022 USD ($) | Apr. 25, 2022 claim
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax charge | $ |  | $ 364 |  | $ 171 |  | $ 346 |  |  | $ 71 |
Payments | $ |  | (6) |  | (11) |  |  |  |  |  |
Loss contingency accrual, provision | $ |  |  |  |  | $ 90 |  |  |  |  |
Individual Smoking and Health Cases [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending |  |  |  |  |  |  |  | 167 |  | 163
Health Care Cost Recovery Actions [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending |  |  |  |  |  |  |  | 1 |  | 1
E-vapor Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending |  |  |  |  |  |  |  | 5,270 |  | 3,744
Loss contingency accrual, provision | $ |  |  | $ 10 |  |  |  |  |  |  |
Loss Contingency, Number Of Patent Infringement Lawsuits | lawsuit |  |  |  |  |  |  | 3 |  |  |
Other Tabacco-Related Cases [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending |  |  |  |  |  |  |  | 3 |  | 3
Tobacco and Health Judgment [Member] | Tobacco and Health and Certain Other Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision | $ |  | 18 |  | 12 |  |  |  |  |  |
Agreement To Resolve Shareholder Class Action | Tobacco and Health and Certain Other Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision | $ |  | $ 0 |  | $ 98 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, class action lawsuit | lawsuit | 17 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 174 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | Illinois [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 20 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | New Mexico [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 14 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | Massachusetts [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 63 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | Florida [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 41 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | ETS Smoking and Health Case, Flight Attendants [Member] | Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases | case | 1,113 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Health Care Cost Recovery Actions [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 1 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | E-vapor Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 5,177 |  |  |  |  |  |  |  |  |
Loss contingency, class action lawsuit | lawsuit | 57 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | E-vapor Litigation [Member] | Pending Individual Lawsuits [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 3,614 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | E-vapor Litigation [Member] | Pending Lawsuits Filed By State Or Local Governments [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 1,506 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | E-vapor Litigation [Member] | Class Action Lawsuit [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 57 |  |  |  |  |  |  |  |  |
Number of pending claims, consolidated for pre-trial purposes | 32 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Other Tabacco-Related Cases [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases pending | 3 |  |  |  |  |  |  |  |  |
Loss contingency, number of inactive cases | case | 1 |  |  |  |  |  |  |  |  |
Loss contingency, number of inactive class action lawsuits | case | 2 |  |  |  |  |  |  |  |  |

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