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Investments in Equity Securities (Summary of Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investments [Line Items] |  |
Investments | $ 20,133 | $ 19,529
ABI [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | 17,390 | 16,651
JUUL [Member] |  |
Investments [Line Items] |  |
JUUL | 1,505 | 1,705
Cronos [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | 1,238 | 1,173
Equity Contract, Warrant [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Derivative asset, fair value, gross asset | 235 | 139
Equity Contract, Preemptive Rights [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Derivative asset, fair value, gross asset | 38 | 24
Common Stock [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | $ 965 | $ 1,010

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