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Investments in Equity Securities (Earnings in Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investment [Line Items] |  |  |  |
Earnings from equity investments | $ 447 | $ 228 | $ 533 | $ 570
ABI [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Earnings from equity investments | 302 | 228 | 388 | 570
Cronos Group Inc. [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Earnings from equity investments | $ 145 | $ 0 | $ 145 | $ 0

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