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Segment Reporting (Pre-tax Asset Impairment, Exit and Implementation Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment and Exit Costs | $ 2 | $ 12 | $ 4 | $ 16
Implementation Costs | 4 | 17 | 5 | 40
Total | 6 | 29 | 9 | 56
Operating Segments [Member] | Smokeable Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment and Exit Costs | 1 | 1 | 1 | 2
Implementation Costs | 1 | 7 | 2 | 12
Total | 2 | 8 | 3 | 14
Operating Segments [Member] | Smokeless Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment and Exit Costs | 1 | 11 | 3 | 14
Implementation Costs | 3 | 10 | 3 | 28
Total | $ 4 | $ 21 | $ 6 | $ 42

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