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

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

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