Investments in Equity Securities (Summary of Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investments [Line Items]
Total	$ 13,481	$ 19,529
ABI [Member]
Investments [Line Items]
Equity method investments	11,144	16,651
JUUL [Member]
Investments [Line Items]
JUUL	1,705	1,705
Cronos [Member]
Investments [Line Items]
Equity method investments	632	1,173
Common Stock [Member] | Cronos [Member]
Investments [Line Items]
Equity method investments	617	1,010
Equity Contract, Warrant [Member] | Cronos [Member]
Investments [Line Items]
Fair value of assets	14	139
Equity Contract, Preemptive Rights [Member] | Cronos [Member]
Investments [Line Items]
Fair value of assets	$ 1	$ 24