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Background and Basis of Presentation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 18 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Apr. 30, 2020
Dec. 31, 2019
Jul. 31, 2019
May 31, 2018
Jan. 31, 2018
ABI [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Equity method investment, ownership percentage 10.10%                
JUUL [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Equity securities, ownership percentage 35.00%         35.00%      
Cronos [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Equity method investment, ownership percentage 45.00%   45.00%            
January 2018 Share Repurchase Program [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Planned share repurchase program               $ 2,000,000,000.0 $ 1,000,000,000.0
Repurchase of common stock (shares)     2.7 34.0          
Average price of repurchased shares, per share (usd per share)     $ 56.34 $ 58.86          
July 2019 Share Repurchase Program [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Planned share repurchase program             $ 1,000,000,000.0    
Repurchase of common stock (shares) 0.0                
Helix Innovations LLC [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Noncontrolling interest, ownership percentage by parent 80.00%                
Business Combination, Consideration Transferred   $ 353,000,000              
Noncontrolling interest, ownership percentage by noncontrolling owners 20.00%                
Subsequent Event [Member] | July 2019 Share Repurchase Program [Member]                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase program, remaining authorized repurchase amount         $ 500,000,000