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Investments in Equity Securities (Earnings in Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investment [Line Items] |  |  |  |
Earnings from equity investments | $ 333 | $ 189 | $ 866 | $ 759
ABI [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Earnings from equity investments | 252 | 189 | 640 | 759
Cronos [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Earnings from equity investments | $ 81 | $ 0 | $ 226 | $ 0

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