Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	12 Months Ended			207 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 9	$ 14	$ 112
Provision related to litigation recorded	90
Payments	(100)	(88)	(175)
Accrued liability for tobacco and health litigation items at end of period	91	9	14	$ 91
Agreement To Resolve Shareholder Class Action [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	90	0	0
Related Interest Costs [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	9	4	5
Tobacco and Health Judgment [Member]
Loss Contingency Accrual [Roll Forward]
Judgments paid (approximately)				896
Litigation settlement interest (approximately)				227
Tobacco and Health Judgment [Member] | Tobacco and Health Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	83	$ 79	$ 72
Engle Progeny Cases [Member]
Loss Contingency Accrual [Roll Forward]
Judgments paid (approximately)				410
Litigation settlement interest (approximately)				56
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingency Accrual [Roll Forward]
Security posted for appeal of judgments	$ 50			$ 50