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Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 162 Months Ended
--- | --- | --- | --- | ---
May 31, 2001 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2015 | Mar. 31, 2018
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Accrued liability for tobacco and health litigation items at beginning of period |  | $ 106 | $ 47 |  |
Payments |  | (23) | (1) |  |
Accrued liability for tobacco and health litigation items at end of period |  | 111 | 47 |  | $ 111
Interest Expense Related To Litigation [Member] |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Pre-tax charges |  | 4 | 0 |  |
Tobacco and Health Judgment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Judgments paid (approximately) |  |  |  |  | 506
Litigation settlement interest expense (income) (approximately) |  |  |  |  | 187
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member] |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Pre-tax charges |  | 24 | $ 1 |  |
Engle Progeny Cases [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Judgments paid (approximately) |  |  |  |  | 114
Litigation settlement interest expense (income) (approximately) |  |  |  |  | 25
PM USA [Member] | Engle Progeny Cases [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Payments made (approximately) | $ 500 |  |  |  |
PM USA [Member] | Engle Progeny Cases, Federal [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Payments made (approximately) |  |  |  | $ 43 | 43
Other Assets [Member] | Pending Litigation [Member] | PM USA [Member] |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Security posted for appeal of judgments (approximately) |  | $ 98 |  |  | $ 98

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