Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended	165 Months Ended
	May 31, 2001	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2015	Jun. 30, 2018
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period		$ 111	$ 106	$ 47	$ 106	$ 47
Payments		(74)		(17)	(97)	(18)
Accrued liability for tobacco and health litigation items at end of period		107	$ 111	47	107	47		$ 107
Interest Expense Related To Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges		10		2	14	2
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)								571
Litigation settlement interest expense (income) (approximately)								194
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges		60		$ 15	84	$ 16
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)								179
Litigation settlement interest expense (income) (approximately)								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
Loss Contingency Accrual [Roll Forward]
Payments							$ (43)
Other Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingency Accrual [Roll Forward]
Security posted for appeal of judgments (approximately)		$ 93			$ 93			$ 93