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Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions | 3 Months Ended | 198 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021
Loss Contingency Accrual [Roll Forward] |  |  |
Accrued liability for tobacco and health litigation items at beginning of period | $ 9 | $ 14 |
Payments | (36) | (28) |
Accrued liability for tobacco and health litigation items at end of period | 8 | 10 | $ 8
Interest Expense Related to Litigation [Member] |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Provision related to litigation recorded | 0 | 2 |
Assets [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Security posted for appeal of judgments | 53 |  | 53
Tobacco and Health Judgment [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Judgments paid (approximately) |  |  | 841
Litigation settlement interest expense (income) |  |  | 218
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member] |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Provision related to litigation recorded | $ 35 | $ 22 |
Engle Progeny Cases [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Judgments paid (approximately) |  |  | 399
Litigation settlement interest expense (income) |  |  | $ 56

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