Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) $ in Millions	3 Months Ended		186 Months Ended
	Mar. 31, 2020 USD ($) case	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) case
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 14	$ 112
Payments	(28)	(109)
Accrued liability for tobacco and health litigation items at end of period	10	20	$ 10
Pre-Trial Resolution [Member]
Loss Contingency Accrual [Roll Forward]
Payments	(7)
Accrued liability for tobacco and health litigation items at end of period	2		2
Interest Expense Related to Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	2	2
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)			748
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	$ 7
Loss contingency, number of pre-trial resolution cases | case	100		100
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	$ 22	$ 15
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)			$ 327
Litigation settlement interest expense (income)			54
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingency Accrual [Roll Forward]
Security posted for appeal of judgments	$ 48		$ 48