Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		180 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 13	$ 107	$ 107	$ 112	$ 106
Payments	(7)		(21)	(151)	(118)
Accrued liability for tobacco and health litigation items at end of period	9	$ 112	107	9	107	$ 9
Interest Expense Related to Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	0		1	5	15
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)						701
Litigation settlement interest expense (income)						214
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	3		$ 20	43	$ 104
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)						309
Litigation settlement interest expense (income)						52
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingency Accrual [Roll Forward]
Security posted for appeal of judgments	$ 41			$ 41		$ 41