Contingencies (Schedule of Pending Cases) (Details) $ in Millions		3 Months Ended			12 Months Ended
	Apr. 22, 2024 claim case lawsuit	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	May 31, 2023 lawsuit	Apr. 24, 2023 claim	Dec. 31, 2022 USD ($)	Apr. 25, 2022 claim
Loss Contingencies [Line Items]
Pre-tax charge | $		$ 364		$ 171		$ 346			$ 71
Payments | $		(6)		(11)
Loss contingency accrual, provision | $					$ 90
Individual Smoking and Health Cases [Member]
Loss Contingencies [Line Items]
Number of cases pending								167		163
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending								1		1
E-vapor Litigation [Member]
Loss Contingencies [Line Items]
Number of cases pending								5,270		3,744
Loss contingency accrual, provision | $			$ 10
Loss Contingency, Number Of Patent Infringement Lawsuits | lawsuit							3
Other Tabacco-Related Cases [Member]
Loss Contingencies [Line Items]
Number of cases pending								3		3
Tobacco and Health Judgment [Member] | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, provision | $		18		12
Agreement To Resolve Shareholder Class Action | Tobacco and Health and Certain Other Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, provision | $		$ 0		$ 98
Subsequent Event [Member]
Loss Contingencies [Line Items]
Loss contingency, class action lawsuit | lawsuit	17
Subsequent Event [Member] | Individual Smoking and Health Cases [Member]
Loss Contingencies [Line Items]
Number of cases pending	174
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | Illinois [Member]
Loss Contingencies [Line Items]
Number of cases pending	20
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | New Mexico [Member]
Loss Contingencies [Line Items]
Number of cases pending	14
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | Massachusetts [Member]
Loss Contingencies [Line Items]
Number of cases pending	63
Subsequent Event [Member] | Individual Smoking and Health Cases [Member] | Pending Litigation [Member] | Florida [Member]
Loss Contingencies [Line Items]
Number of cases pending	41
Subsequent Event [Member] | ETS Smoking and Health Case, Flight Attendants [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Number of cases | case	1,113
Subsequent Event [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending	1
Subsequent Event [Member] | E-vapor Litigation [Member]
Loss Contingencies [Line Items]
Number of cases pending	5,177
Loss contingency, class action lawsuit | lawsuit	57
Subsequent Event [Member] | E-vapor Litigation [Member] | Pending Individual Lawsuits [Member]
Loss Contingencies [Line Items]
Number of cases pending	3,614
Subsequent Event [Member] | E-vapor Litigation [Member] | Pending Lawsuits Filed By State Or Local Governments [Member]
Loss Contingencies [Line Items]
Number of cases pending	1,506
Subsequent Event [Member] | E-vapor Litigation [Member] | Class Action Lawsuit [Member]
Loss Contingencies [Line Items]
Number of cases pending	57
Number of pending claims, consolidated for pre-trial purposes	32
Subsequent Event [Member] | Other Tabacco-Related Cases [Member]
Loss Contingencies [Line Items]
Number of cases pending	3
Loss contingency, number of inactive cases | case	1
Loss contingency, number of inactive class action lawsuits | case	2