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Segment Reporting (Narrative) (Details)
$ in Millions
3 Months Ended
Jun. 30, 2017
USD ($)
case
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Miner [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded     $ 45  
Aspinall [Member] | PM USA [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded       $ 32
Operating Segments [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member] | PM USA [Member]        
Segment Reporting Information [Line Items]        
Number of Engle Progeny Cases | case 4      
Operating Segments [Member] | Smokeless Products [Member]        
Segment Reporting Information [Line Items]        
Recall impact on operating income   $ 60    
Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member] | PM USA [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded $ 15      
Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Smokeable Products [Member] | Miner [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded     $ 45  
Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Smokeable Products [Member] | Aspinall [Member] | PM USA [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded       26
Operating Segments [Member] | Interest Expense [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member] | PM USA [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded $ 2      
Operating Segments [Member] | Interest Expense [Member] | Smokeable Products [Member] | Aspinall [Member] | PM USA [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded       $ 12