Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		177 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 20	$ 111	$ 112	$ 106
Payments	(35)	(74)	(144)	(97)
Accrued liability for tobacco and health litigation items at end of period	13	107	13	107	$ 13
Interest Expense Related to Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	3	10	5	14
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)					698
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	25	$ 60	40	$ 84
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)					306
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	$ 40		$ 40		$ 40