Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		240 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 151	$ 373	$ 381	$ 346	$ 71
Payments	(37)		(31)	(300)	(122)
Accrued liability for tobacco and health litigation items at end of period	136	346	373	136	373	$ 136
Related Interest Costs [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	1		0	1	11
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Security posted for appeal of judgments	31			31		31
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid						1,100
Litigation settlement interest expense (income)						242
Tobacco and Health Judgment [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	21		23	59	75
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid						449
Litigation settlement interest expense (income)						$ 61
Agreement To Resolve Shareholder Class Action | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	0		0	0	98
JUUL-related settlements [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	$ 0		$ 0	$ 30	$ 240
Health Care Cost Recovery Actions, 2005-2007 NPM Adjustment [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Litigation settlement interest expense (income)		$ (21)