Segment Reporting (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2015 case	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($) case	Mar. 31, 2015 USD ($) case
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
Federal Engle Progeny Cases [Member] | PM USA [Member]
Segment Reporting Information [Line Items]
Provision related to litigation recorded					$ 43
Number of claims resolved | case	415				415
Operating Segments [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member]
Segment Reporting Information [Line Items]
Number of claims resolved | case				6
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]
Segment Reporting Information [Line Items]
Provision related to litigation recorded			26
Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member]
Segment Reporting Information [Line Items]
Provision related to litigation recorded				$ 54
Operating Segments [Member] | Selling, General and Administrative Expenses [Member] | Smokeable Products [Member] | Federal Engle Progeny Cases [Member]
Segment Reporting Information [Line Items]
Provision related to litigation recorded					$ 43
Operating Segments [Member] | Interest Expense [Member] | Smokeable Products [Member] | Aspinall [Member]
Segment Reporting Information [Line Items]
Provision related to litigation recorded			$ 12
Operating Segments [Member] | Interest Expense [Member] | Smokeable Products [Member] | Engle Progeny Cases [Member]
Segment Reporting Information [Line Items]
Provision related to litigation recorded				$ 13