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Background and Basis of Presentation (Narrative) (Details) - USD ($) shares in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jan. 31, 2024 | Jan. 31, 2023
Horizon [Member] | PM USA [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Ownership percentage in consolidated subsidiary | 75.00% |  |  | 75.00% |  |  |
Horizon [Member] | JTIUH [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 25.00% |  |  | 25.00% |  |  |
January 2023 Share Repurchase Program [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  | $ 1,000,000,000
Repurchase of common stock (shares) |  |  | 10.4 |  | 10.4 |  |
January 2024 Share Repurchase Program [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Planned share repurchase program |  | $ 3,400,000,000 |  |  |  | $ 1,000,000,000.0 |
Repurchase of common stock (shares) | 7.6 |  |  | 54.1 |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 990,000,000 |  |  | $ 990,000,000 |  |  |
ASR Agreements [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Planned share repurchase program |  | $ 2,400,000,000 |  |  |  |  |
Repurchase of common stock (shares) | 7.4 | 46.5 |  | 53.9 |  |  |
Accelerated share repurchases, percentage of stock | 85.00% |  |  | 85.00% |  |  |

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