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Income Taxes (Summary of Valuation Allowance) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Balance at beginning of year $ 71 $ 0 $ 240
Additions to valuation allowance related to Altria’s initial investment in Cronos 352 0 0
Additions to valuation allowance charged to income tax expense 2,063 71 0
Reductions to valuation allowance credited to income tax benefit (159) 0 (240)
Foreign currency translation (3) 0 0
Balance at end of year $ 2,324 $ 71 $ 0