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Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 168 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2015 | Sep. 30, 2018
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |
Accrued liability for tobacco and health litigation items at beginning of period | $ 107 | $ 47 | $ 47 | $ 106 | $ 47 |  |
Payments | (21) |  | 0 | (118) | (18) |  |
Accrued liability for tobacco and health litigation items at end of period | 107 | $ 106 | 47 | 107 | 47 |  | $ 107
Interest Expense Related To Litigation [Member] |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |
Pre-tax charges | 1 |  | 0 | 15 | 2 |  |
Tobacco and Health Judgment [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Judgments paid (approximately) |  |  |  |  |  |  | 578
Litigation settlement interest expense (income) |  |  |  |  |  |  | 195
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member] |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |
Pre-tax charges | 20 |  | $ 0 | 104 | $ 16 |  |
Engle Progeny Cases [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Judgments paid (approximately) |  |  |  |  |  |  | 186
Litigation settlement interest expense (income) |  |  |  |  |  |  | 33
PM USA [Member] | Engle Progeny Cases, Federal [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Payments made |  |  |  |  |  |  | 43
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |
Payments |  |  |  |  |  | $ (43) |
Assets [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |
Security posted for appeal of judgments | $ 99 |  |  | $ 99 |  |  | $ 99

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