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Exit and Implementation Costs (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Dec. 31, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Exit or implementation costs |  |  |  | $ 0 |  |
Exit costs | $ 2,000,000 | $ 0 | $ 3,000,000 | $ 354,000,000 |  |
Operating Segments [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Implementation costs | 11,000,000 |  | 40,000,000 |  |  |
Exit costs | 2,000,000 |  | 3,000,000 |  |  |
Operating Segments [Member] | Smokeable Products Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Implementation costs | 10,000,000 |  | 35,000,000 |  |  |
Exit costs | 2,000,000 |  | 3,000,000 |  |  |
Operating Segments [Member] | Oral Tobacco Products [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Implementation costs | 1,000,000 |  | 5,000,000 |  |  |
Exit costs | 0 |  | 0 |  |  |
Initiative [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Exit or implementation costs | 13,000,000 |  | 43,000,000 |  |  |
Restructuring and related cost, expected cost | $ 125,000,000 |  | 125,000,000 |  | $ 125,000,000 |
Restructuring charges |  |  | 111,000,000 |  |  |
Severance costs |  |  | 38,000,000 |  |  |
Implementation costs |  |  | 73,000,000 |  |  |
Payments for restructuring |  |  | 63,000,000 |  | 74,000,000 | $ 11,000,000
Initiative [Member] | Exit Costs [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Payments for restructuring |  |  | 12,000,000 |  | 12,000,000 | 0
Initiative [Member] | Implementation Costs [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Payments for restructuring |  |  | $ 51,000,000 |  | $ 62,000,000 | $ 11,000,000

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