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Background and Basis of Presentation (Narrative) (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Mar. 31, 2023 | Jan. 31, 2023 | Oct. 31, 2021 | Jan. 31, 2021
Horizon [Member] | PM USA [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Ownership percentage in consolidated subsidiary |  | 75.00% |  |  |
Horizon [Member] | JTIUH [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  | 25.00% |  |  |
NJOY Holdings, Inc. [Member] | Forecast [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Payments to acquire businesses, gross | $ 2,750,000,000 |  |  |  |
Business combination, contingent consideration, liability | $ 500,000,000 |  |  |  |
January 2021 Share Repurchase Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Planned share repurchase program |  |  |  | $ 3,500,000,000 | $ 2,000,000,000
January 2023 Share Repurchase Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Planned share repurchase program |  |  | $ 1,000,000,000 |  |

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