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Investments in Equity Securities (Earnings in Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings (losses) from equity investments | $ (472) | $ 333 | $ (306) | $ 866
ABI [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings (losses) from equity investments | (418) | 252 | (306) | 640
Cronos [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings (losses) from equity investments | $ (54) | $ 81 | $ 0 | $ 226

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