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Background and Basis of Presentation (Details)
$ / shares in Units, $ in Billions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
director
board_member
shares
Jun. 30, 2019
CAD ($)
Dec. 31, 2018
USD ($)
board_member
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Jun. 30, 2019
CAD ($)
director
board_member
$ / shares
shares
Jan. 31, 2019
USD ($)
Jan. 31, 2019
CAD ($)
Dec. 20, 2018
USD ($)
Dec. 07, 2018
shares
Sep. 30, 2018
shares
Oct. 10, 2016
shares
Oct. 09, 2016
Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]                            
Earnings from equity investment in AB InBev/SABMiller     $ 890,000,000 $ 532,000,000 $ 795,000,000                  
SABMiller Plc [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Equity method investment, ownership percentage (approximately)                         27.00% 27.00%
Ordinary shares owned/purchased (in shares) | shares                       430,000,000    
Earnings from equity investment in AB InBev/SABMiller         $ 795,000,000                  
AB InBev [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Equity method investment, ownership percentage (approximately)     10.10%   10.20%             9.60%    
Ordinary shares owned/purchased (in shares) | shares         12,000,000           92,400,000      
Earnings from equity investment in AB InBev/SABMiller     $ 890,000,000 532,000,000 $ 0                  
JUUL [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Equity securities Fv Ni, ownership percentage                 35.00%          
Equity securities Fv-Ni, purchase price                 $ 12,800,000,000          
Cronos Group Inc. [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Equity method investment, number of shares eligible for purchase (in shares) | shares                   146,200,000        
Number of board of directors | board_member     5                      
Scenario, Forecast [Member] | Cronos Group Inc. [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Equity method investment, ownership percentage (approximately) 45.00%         45.00%                
Equity method investment, number of shares eligible for purchase (in shares) | shares 72,200,000         72,200,000                
Equity method investment, shares purchased, price per share (in CAD per share) | $ / shares           $ 19.00                
Equity method investments, purchase price $ 1,800,000,000         $ 2.4                
Equity method investment, expiration period 4 years 4 years                        
Equity method investment, warrant exercised, ownership percentage 55.00% 55.00%                        
Equity method investment, warrant exercise price $ 1,400,000,000 $ 1.0                        
Number of directors | director 4         4                
Number of independent directors | director 1         1                
Number of board of directors | board_member 7         7                
Accounting Standards Update 2016-18 [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Restricted cash and cash equivalents, current       $ 61,000,000 $ 82,000,000                  
Forward Contracts [Member] | Subsequent Event [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Notional amount of option             $ 1,100,000,000 $ 1.5