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Investments in Equity Securities (Summary of Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investments [Line Items] |  |
Investments | $ 23,861.0 | $ 23,581.0
ABI [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | 18,453.0 | 18,071.0
JUUL [Member] |  |
Investments [Line Items] |  |
Equity securities without readily determinable fair value, amount | 4,205.0 | 4,205.0
Cronos [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | 1,203.0 | 1,305.0
Equity Contract, Warrant [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Derivative asset, fair value, gross asset | 132.0 | 234.0
Equity Contract, Preemptive Rights [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Derivative asset, fair value, gross asset | 34.0 | 69.0
Common Stock [Member] | Cronos [Member] |  |
Investments [Line Items] |  |
Investments in equity securities | $ 1,037.0 | $ 1,002.0

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