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Investments in Equity Securities (Earnings in Equity Securities) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (losses) from investments under equity method of accounting | $ (6,015,000,000) | $ (472,000,000) | $ (5,789,000,000) | $ (306,000,000) |
Income (losses) from equity investments | (5,915,000,000) | (472,000,000) | (5,789,000,000) | (306,000,000) |
ABI [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (losses) from investments under equity method of accounting | (6,036,000,000) | (418,000,000) | (5,644,000,000) | (306,000,000) |
Equity method investment, impairment | 6,157,000,000 |  | 6,157,000,000 |  | $ 0
Cronos [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (losses) from investments under equity method of accounting | 21,000,000 | (54,000,000) | (145,000,000) | 0 |
JUUL [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
JUUL | $ 100,000,000 | $ 0 | $ 0 | $ 0 |

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