Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended	237 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2021	Jun. 30, 2024
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period	$ 364	$ 346		$ 171	$ 346	$ 71
Loss contingency accrual, provision							$ 90
Payments	(257)			(80)	(263)	(91)
Accrued liability for tobacco and health litigation items at end of period	151	$ 364	$ 346	381	151	381		$ 151
Related Interest Costs [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	0			10	0	11
Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Security posted for appeal of judgments	37				37			37
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid								1,100
Litigation settlement interest expense (income)								241
Tobacco and Health Judgment [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, provision	20			40	38	52
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid								444
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	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	$ 24			$ 240	$ 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)