Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended				9 Months Ended		12 Months Ended	156 Months Ended
	May 31, 2016	May 31, 2001	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2017
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period			$ 47	$ 75	$ 30	$ 132	$ 47	$ 132
Payments			0		0		(18)	(145)
Accrued liability for tobacco and health litigation items at end of period			47	$ 47	75		47	75	$ 132	$ 47
Aspinall [Member]
Loss Contingencies [Line Items]
Litigation settlement interest expense (income) (approximately)								10
Interest Expense Related To Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges			0		0		2	6
Miner [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges					45
Miner [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges			0		45		0	45
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)										490
Litigation settlement interest expense (income) (approximately)										184
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges			0		0		16	5
Aspinall [Member]
Loss Contingency Accrual [Roll Forward]
Payments	$ (32)
Aspinall [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges			0		$ 0		0	$ 32
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)										99
Litigation settlement interest expense (income) (approximately)										22
PM USA [Member] | Aspinall [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges						$ 32
PM USA [Member] | Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Payments made (approximately)		$ 500
PM USA [Member] | Engle Progeny Cases, Federal [Member]
Loss Contingencies [Line Items]
Payments made (approximately)									$ 43	43
Other Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Security posted for appeal of judgments (approximately)			$ 61				$ 61			$ 61