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Investments in Equity Securities (Summary of Investments) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment [Line Items] |  |
Investments | $ 27,346 | $ 30,496
ABI [Member] |  |
Investment [Line Items] |  |
Investments in equity securities | 17,950 | 17,696
JUUL [Member] |  |
Investment [Line Items] |  |
Equity securities, Fv-Ni | 8,305 | 12,800
Cronos [Member] |  |
Investment [Line Items] |  |
Investments in equity securities | 1,091 | $ 0
Equity Contract, Warrant [Member] | Cronos [Member] |  |
Investment [Line Items] |  |
Derivative asset, fair value, gross asset | 315 |
Equity Contract, Preemptive Rights [Member] | Cronos [Member] |  |
Investment [Line Items] |  |
Derivative asset, fair value, gross asset | 103 |
Common Stock [Member] | Cronos [Member] |  |
Investment [Line Items] |  |
Investments in equity securities | $ 673 |

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