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Segment Reporting (Pre-tax Asset Impairment, Exit and Implementation Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment and Exit Costs | $ (2) | $ 8 | $ 2 | $ 24
Implementation Costs | (1) | 7 | 4 | 47
Total | (3) | 15 | 6 | 71
Operating Segments [Member] | Smokeable Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment and Exit Costs | (5) | 0 | (4) | 2
Implementation Costs | (1) | 5 | 1 | 17
Total | (6) | 5 | (3) | 19
Operating Segments [Member] | Smokeless Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment and Exit Costs | 3 | 8 | 6 | 22
Implementation Costs | 0 | 2 | 3 | 30
Total | $ 3 | $ 10 | $ 9 | $ 52

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