Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended		222 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2023
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 71	$ 91	$ 91
Loss contingency accrual, provision				$ 90
Payments	(11)	(103)
Accrued liability for tobacco and health litigation items at end of period	171	0	$ 71	$ 91	$ 171
Related Interest Costs [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	1	0
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Security posted for appeal of judgments	46				46
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)					963
Litigation settlement interest expense (income)					231
Tobacco and Health Judgment [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	12	12
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid (approximately)					436
Litigation settlement interest expense (income)					$ 60
Agreement To Resolve Shareholder Class Action | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	$ 98	$ 0