Contingencies (Non-Engle Progeny Litigation) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2021	May 31, 2023	Feb. 28, 2023	Sep. 30, 2022	Feb. 28, 2021	May 31, 2020	Sep. 30, 2019
Loss Contingencies [Line Items]
Loss contingency accrual, provision			$ 90,000,000
Non-Engle Progeny Smoking And Health Case, Deswert [Member] | Forecast [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, provision	$ 1,000,000
Non-Engle Progeny Smoking And Health Case, Deswert [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded				$ 1,000,000
Loss contingency, fault allocation percentage				50.00%
Non-Engle Progeny Smoking And Health Case, Woodley [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded					$ 5,000,000
Punitive damages awarded					$ 0
Non-Engle Progeny Smoking And Health Case, Fontaine [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded						$ 8,000,000
Punitive damages awarded						$ 1,000,000,000
Non-Engle Progeny Smoking and Health Case, Greene [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, provision		$ 48,000,000
Non-Engle Progeny Smoking and Health Case, Greene [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded							$ 2,300,000	$ 30,000,000	$ 10,000,000