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

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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