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Exit and Implementation Costs (Pre-tax Exit and Implementation Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |
Exit costs | $ 2 | $ 0 | $ 3 | $ 354
Operating Segments [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Exit costs | 2 |  | 3 |
Implementation Costs | 11 |  | 40 |
Operating Segments [Member] | Smokeable Products Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Exit costs | 2 |  | 3 |
Implementation Costs | 10 |  | 35 |
Operating Segments [Member] | Oral Tobacco Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Exit costs | 0 |  | 0 |
Implementation Costs | $ 1 |  | $ 5 |

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