Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		252 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 95	$ 136	$ 151	$ 96	$ 346
Payments	(30)		(37)	(76)	(300)
Accrued liability for tobacco and health litigation items at end of period	68	$ 96	136	68	136	$ 68
Related Interest Costs [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	0		1	4	1
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Security posted for appeal of judgments	24			24		24
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid						1,100
Litigation settlement interest expense (income)						246
Tobacco and Health Judgment [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	4		21	44	59
Shareholder derivative lawsuits [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	0		0	0	0
JUUL-related settlements [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	$ (1)		$ 0	$ 0	$ 30
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid						452
Litigation settlement interest expense (income)						$ 62