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Investments in Equity Securities (Investment in Cronos Narrative) (Details)
$ / shares in Units, shares in Thousands, $ in Millions, $ in Billions
3 Months Ended
Apr. 25, 2022
USD ($)
Mar. 31, 2022
CAD ($)
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2022
$ / shares
Dec. 31, 2021
USD ($)
Investments [Line Items]          
Fair value of equity investment     $ 11,300    
Cronos [Member]          
Investments [Line Items]          
Ownership percentage     41.70%    
Number of ordinary shares owned (approximately) (in shares) | shares     156,600    
Equity method investment, difference between carrying amount and underlying equity     $ 55    
Equity method investment, difference between carrying amount and fair value, percentage (approximately)     10.00%    
Fair value of equity investment         $ 617
Equity method investments     $ 556   632
Cronos [Member] | Subsequent Event [Member]          
Investments [Line Items]          
Equity method investment, difference between carrying amount and underlying equity $ 74        
Equity method investment, difference between carrying amount and fair value, percentage (approximately) 13.00%        
Equity Contract, Preemptive Rights [Member] | Cronos [Member]          
Investments [Line Items]          
Equity method investment, shares purchased, (CAD per share) | $ / shares       $ 16.25  
Equity method investment, number of shares eligible for purchase (approximately) (in shares) | shares     11,000    
Equity method investment, aggregate exercise price   $ 0.2      
Equity Contract, Preemptive Rights [Member] | Cronos [Member] | Subsequent Event [Member]          
Investments [Line Items]          
Equity method investment, aggregate exercise price $ 100        
Equity Contract, Warrant [Member] | Cronos [Member]          
Investments [Line Items]          
Equity method investment, shares purchased, (CAD per share) | $ / shares       $ 19.00  
Equity method investment, number of shares eligible for purchase (approximately) (in shares) | shares     83,000    
Equity method investment, percentage of shares eligible for purchase (approximately)     10.00%    
Equity method investment, aggregate exercise price   $ 1.6      
Equity Contract, Warrant [Member] | Cronos [Member] | Subsequent Event [Member]          
Investments [Line Items]          
Equity method investment, aggregate exercise price $ 1,200        
Equity Contract, Warrant And Equity Contract, Preemptive Rights [Member] | Cronos [Member]          
Investments [Line Items]          
Equity method investment, warrant exercised, ownership percentage   52.00%      
Common Stock [Member] | Cronos [Member]          
Investments [Line Items]          
Equity method investments     $ 551   $ 617