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

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

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