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Investments in Equity Securities (Investment in Cronos Narrative) (Details)
$ / shares in Units, shares in Thousands, $ in Millions, $ in Billions
9 Months Ended 12 Months Ended
Oct. 25, 2021
USD ($)
Sep. 30, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2021
$ / shares
Investments [Line Items]          
Equity method investment, difference between carrying amount and underlying equity     $ 77 $ 14  
Cronos [Member]          
Investments [Line Items]          
Ownership percentage     43.50% 41.90%  
Number of ordinary shares owned (approximately) (in shares) | shares       156,600  
Equity method investment, difference between carrying amount and fair value, percentage (approximately)   2.00% 8.00%    
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       14,000  
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 $ 200        
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 $ 1,300        
Equity Contract, Warrant And Equity Contract, Preemptive Rights [Member] | Cronos [Member]          
Investments [Line Items]          
Equity method investment, warrant exercised, ownership percentage   53.00%