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Investments in Equity Securities (Investment in Cronos Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions, $ in Billions
1 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
$ / shares
shares
Mar. 31, 2019
CAD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
director
board_member
shares
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
USD ($)
Investments [Line Items]            
Equity method investment, difference between carrying amount and fair value, percentage       8.00% 8.00% 20.00%
Cronos [Member]            
Investments [Line Items]            
Equity method investment, number of shares owned, common (in shares) | shares   149.8 149.8 156.6    
Equity method investment, ownership percentage (approximately)   45.00% 45.00% 43.50%   45.00%
Payments to acquire equity method investments and derivative instruments, investing $ 1,800 $ 2.4 $ 2.4      
Equity method investment, warrant exercised, ownership percentage       54.00% 54.00%  
Payments to acquire equity method investments 400          
Payments for deferred tax liability 300          
Number of directors nominated | director       4    
Number of independent directors nominated | director       1    
Number of members on the board of directors | board_member       7    
Difference between carrying amount and underlying equity       $ 200    
Equity method investments       1,173   $ 1,305
Cronos [Member] | Common Stock [Member]            
Investments [Line Items]            
Equity method investments       1,010   1,002
Cronos [Member] | Level 1 [Member]            
Investments [Line Items]            
Fair value of investment       $ 1,100   $ 1,200
Equity Contract, Preemptive Rights [Member] | Cronos [Member]            
Investments [Line Items]            
Equity method investment, price per share if exercised | $ / shares   $ 16.25 $ 16.25      
Equity method investment, number of shares eligible for purchase | shares       30.0    
Payments for derivative instrument, investing activities 500          
Equity method investment, total exercise price       $ 400 $ 0.5  
Equity Contract, Warrant [Member] | Cronos [Member]            
Investments [Line Items]            
Equity method investment, price per share if exercised | $ / shares   $ 19.00 $ 19.00      
Equity method investment, number of shares eligible for purchase | shares       80.0    
Equity method investment, percentage of shares eligible for purchase   10.00% 10.00%      
Payments for derivative instrument, investing activities $ 1,200          
Equity method investment, total exercise price       $ 1,200 $ 1.5