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Segment Reporting (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Marketing, Administration and Research Costs Expenses [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded $ 60 $ 15   $ 84
Interest And Other Debt Expense, Net [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member]        
Segment Reporting Information [Line Items]        
Provision related to litigation recorded $ 10 $ 2   $ 14
Operating Segments [Member] | Smokeless Products [Member]        
Segment Reporting Information [Line Items]        
Recall impact on operating income     $ 60