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Investments in Equity Securities (Summary of Investments) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investments [Line Items] |  |
Investments | $ 19,408 | $ 23,581
ABI [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | 16,716 | 18,071
JUUL [Member] |  |
Investments [Line Items] |  |
Equity securities without readily determinable fair value, amount | 1,605 | 4,205
Cronos [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | 1,087 | 1,305
Equity Contract, Warrant [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Derivative asset, fair value, gross asset | 86 | 234
Equity Contract, Preemptive Rights [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Derivative asset, fair value, gross asset | 15 | 69
Common Stock [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | $ 986 | $ 1,002

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