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Investments in Equity Securities (Summary of Investments) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Investments [Line Items]    
Investments $ 20,133 $ 19,529
ABI [Member]    
Investments [Line Items]    
Investments in equity securities 17,390 16,651
JUUL [Member]    
Investments [Line Items]    
JUUL 1,505 1,705
Cronos [Member]    
Investments [Line Items]    
Investments in equity securities 1,238 1,173
Equity Contract, Warrant [Member] | Cronos [Member]    
Investments [Line Items]    
Derivative asset, fair value, gross asset 235 139
Equity Contract, Preemptive Rights [Member] | Cronos [Member]    
Investments [Line Items]    
Derivative asset, fair value, gross asset 38 24
Common Stock [Member] | Cronos [Member]    
Investments [Line Items]    
Investments in equity securities $ 965 $ 1,010