Contingencies (Engle Progeny Cases Trial Results - Pending and Concluded) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Apr. 30, 2022	May 31, 2021	Feb. 29, 2020	Jan. 31, 2020	Nov. 30, 2019	Sep. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Jul. 31, 2018	Nov. 30, 2017	Apr. 30, 2017	Mar. 31, 2016	Jan. 31, 2015
Loss Contingencies [Line Items]
Provision related to litigation recorded		$ 90
Engle Progeny Cases, Schertzer [Member] | Pending Litigation [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded			$ 3
Engle Progeny Cases, Schertzer [Member] | Pending Litigation [Member] | PM USA [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Punitive damages awarded			$ 0
Engle Progeny Cases, Lipp [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded	$ 15
Engle Progeny Cases, Lipp [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded	28
Engle Progeny Cases, Garcia [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded				$ 6
Engle Progeny Cases, Duignan [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded					$ 3
Engle Progeny Cases, Duignan [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded					$ 12
Engle Progeny Cases, Cuddihee [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded						$ 3
Engle Progeny Cases, Cuddihee [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded						$ 0
Engle Progeny Cases, Rintoul [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded							$ 9
Engle Progeny Cases, Rintoul [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded							74
Engle Progeny Cases, Gloger [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded							15
Engle Progeny Cases, Gloger [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded							$ 11
Engle Progeny Cases, McCall [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded								$ 1
Engle Progeny Cases, McCall [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded								1
Punitive damages awarded								0
Engle Progeny Cases, Neff [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded								4
Engle Progeny Cases, Neff [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded								$ 2
Engle Progeny Cases, Mahfuz [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded										$ 12
Engle Progeny Cases, Mahfuz [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded										10
Engle Progeny Cases, Holliman [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded										3
Engle Progeny Cases, Holliman [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded										$ 0
Engle Progeny Cases, Chadwell [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded									$ 2
Engle Progeny Cases, Chadwell [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded									$ 0
Engle Progeny Cases, Kaplan [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded											$ 2
Engle Progeny Cases, Kaplan [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded											$ 2
Engle Progeny Cases, R. Douglas [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded												$ 1
Engle Progeny Cases, R. Douglas [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded												$ 0
Engle Progeny Cases, Sommers [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded													$ 1
Provision related to litigation recorded	$ 1
Engle Progeny Cases, Sommers [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded													$ 0
Engle Progeny Cases, Cooper [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded														$ 5
Engle Progeny Cases, Cooper [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded														1
Punitive damages awarded														$ 0
Engle Progeny Cases, D. Brown [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded															$ 8
Engle Progeny Cases, D. Brown [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded															$ 9