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Background and Basis of Presentation (Narrative) (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2025 | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 $ / shares shares | Jun. 30, 2024 shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 $ / shares shares | Oct. 29, 2025 USD ($) | Jan. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 USD ($) agreement
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend rate increase, percentage | 3.90% |  |  |  |  |  |  |  |  |
Dividends declared (usd per share) | $ / shares |  | $ 1.06 | $ 1.02 |  | $ 3.10 | $ 2.98 |  |  |  |
Annual dividend (usd per share) | $ / shares |  | $ 4.24 |  |  | $ 4.24 |  |  |  |  |
Number of agreements | agreement |  |  |  |  |  |  |  |  |  | 2
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 2025 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 288,000,000 |  |  | $ 288,000,000 |  |  |  |  |
Repurchase of common stock (shares) | shares |  | 1.9 |  |  | 12.3 |  |  |  |  |
January 2025 Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  |
Additional amount authorized |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |
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
Repurchase of common stock (shares) | shares |  |  | 13.5 |  |  | 67.6 |  |  |  |
ASR Agreements [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  |  | $ 2,400,000,000 |
Repurchase of common stock (shares) | shares |  |  |  | 53.9 |  | 53.9 |  |  |  |

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