Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Balance at beginning of year	$ 2,817	$ 2,324	$ 71
Additions to valuation allowance related to Altria’s initial Investment in Cronos	0	0	352
Additions to valuation allowance charged to income tax expense	401	692	2,063
Reductions to valuation allowance credited to income tax benefit	(118)	(200)	(159)
Foreign currency translation	(3)	1	(3)
Balance at end of year	$ 3,097	$ 2,817	$ 2,324