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Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 234 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2021 | Mar. 31, 2024
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Accrued liability for tobacco and health litigation items at beginning of period | $ 346 |  | $ 71 |  |
Loss contingency accrual, provision |  |  |  | $ 90 |
Payments | (6) |  | (11) |  |
Accrued liability for tobacco and health litigation items at end of period | 364 | $ 346 | 171 |  | $ 364
Related Interest Costs [Member] |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Loss contingency accrual, provision | 0 |  | 1 |  |
Assets [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Security posted for appeal of judgments | 38 |  |  |  | 38
Tobacco and Health Judgment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Judgments paid |  |  |  |  | 1,000
Litigation settlement interest expense (income) |  |  |  |  | 241
Tobacco and Health Judgment [Member] | Tobacco and Health and Certain Other Litigation [Member] |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Loss contingency accrual, provision | 18 |  | 12 |  |
Engle Progeny Cases [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Judgments paid |  |  |  |  | 440
Litigation settlement interest expense (income) |  |  |  |  | $ 60
Agreement To Resolve Shareholder Class Action | Tobacco and Health and Certain Other Litigation [Member] |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Loss contingency accrual, provision | 0 |  | 98 |  |
JUUL-related settlements [Member] | Tobacco and Health and Certain Other Litigation [Member] |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Loss contingency accrual, provision | $ 6 |  | $ 0 |  |
Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement interest expense (income) |  | $ (21) |  |  |

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