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Investments in Equity Securities (Summary of Investments) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Investments in equity securities | $ 32,094 | $ 30,496
Investments | 32,094 | 30,496
ABI [Member] |  |
Investment [Line Items] |  |
Investments in equity securities | 17,669 | 17,696
JUUL [Member] |  |
Investment [Line Items] |  |
Equity securities, Fv-Ni | 12,805 | 12,800
Cronos Group Inc. [Member] |  |
Investment [Line Items] |  |
Investments in equity securities | 1,620 | $ 0
Equity Contract, Warrant [Member] | Cronos Group Inc. [Member] |  |
Investment [Line Items] |  |
Derivative asset, fair value, gross asset | 763 |
Equity Contract, Preemptive Rights [Member] | Cronos Group Inc. [Member] |  |
Investment [Line Items] |  |
Derivative asset, fair value, gross asset | 313 |
Common Stock [Member] | Cronos Group Inc. [Member] |  |
Investment [Line Items] |  |
Investments in equity securities | $ 544 |

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