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Segment Reporting (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
case
Mar. 31, 2017
USD ($)
Smokeable Products [Member] | Engle Progeny Cases [Member] | PM USA [Member]    
Segment Reporting Information [Line Items]    
Number of cases | case 3  
Selling, General and Administrative Expenses [Member] | Smokeable Products [Member]    
Segment Reporting Information [Line Items]    
Provision related to litigation recorded $ 24  
Interest And Other Debt Expense, Net [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member]    
Segment Reporting Information [Line Items]    
Provision related to litigation recorded $ 4  
Operating Segments [Member] | Smokeless Products [Member]    
Segment Reporting Information [Line Items]    
Recall impact on operating income   $ 60