Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) $ in Millions	3 Months Ended		6 Months Ended		189 Months Ended
	Jun. 30, 2020 USD ($) case	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) case	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) case
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 10	$ 20	$ 14	$ 112
Payments	(6)	(35)	(34)	(144)
Accrued liability for tobacco and health litigation items at end of period	22	13	22	13	$ 22
Pre-Trial Resolution [Member]
Loss Contingency Accrual [Roll Forward]
Payments			(12)
Accrued liability for tobacco and health litigation items at end of period	2		2		2
Interest Expense Related to Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	1	3	3	5
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingency Accrual [Roll Forward]
Security posted for appeal of judgments	$ 68		68		68
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)					753
Litigation settlement interest expense (income)					$ 216
Tobacco and Health Judgment [Member] | Pre-Trial Resolution [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded			$ 12
Loss contingency, number of pre-trial resolution cases | case	200		200		200
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	$ 17	$ 25	$ 39	$ 40
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)					$ 327
Litigation settlement interest expense (income)					$ 54