Contingencies (Engle Progeny Cases Trial Results - Pending and Concluded) (Details) - USD ($) $ in Millions	3 Months Ended									6 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Jan. 31, 2020	Nov. 30, 2019	Feb. 28, 2019	Jul. 31, 2018	May 31, 2018	Nov. 30, 2017	Apr. 30, 2017	Mar. 31, 2017	Sep. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Sep. 30, 2014	Jul. 31, 2014
Loss Contingencies [Line Items]
Provision related to litigation recorded	$ 29	$ 3	$ 28	$ 17	$ 12	$ 21	$ 70	$ 28
Engle Progeny Cases, Berger [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																						$ 6
Provision related to litigation recorded					6
Engle Progeny Cases, Berger [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded																						$ 21
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]
Compensatory damages awarded												5
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]
Compensatory damages awarded												5
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				1
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, Frogel [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded				1
Engle Progeny Cases, Frogel [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded				1
Punitive damages awarded				0
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				$ 2
Engle Progeny Cases, Chadwell [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded						0				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, Landi [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded							8
Engle Progeny Cases, Landi [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded							5
Engle Progeny Cases, Theis [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded															$ 7
Engle Progeny Cases, Theis [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded															$ 10
Engle Progeny Cases, Freeman [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded								4
Engle Progeny Cases, Freeman [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded								$ 0
Engle Progeny Cases, R. Douglas [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																$ 1
Punitive damages awarded																$ 0
Engle Progeny Cases, Sommers [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																	$ 1
Engle Progeny Cases, Sommers [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded																	$ 0
Engle Progeny Cases, Santoro [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																		$ 2
Engle Progeny Cases, Santoro [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
Engle Progeny Cases, Kerrivan [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																					$ 16
Engle Progeny Cases, Kerrivan [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded																					$ 16
Engle Progeny Cases, Harris [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																							$ 2
Engle Progeny Cases, Harris [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																							1
Punitive damages awarded																							$ 0
Engle Progeny Cases, Alvarez del Real [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value	$ 1
Engle Progeny Cases, Zingaro [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value		$ 1
Engle Progeny Cases, Bryant [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value			1
Engle Progeny Cases, Wallace [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value			$ 26
Engle Progeny Cases, J. Brown [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value				4
Engle Progeny Cases, L. Martin [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value				2
Engle Progeny Cases, Danielson [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value				3
Engle Progeny Cases, S. Martin [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value				$ 5
Engle Progeny Cases, Searcy [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value						$ 2
Engle Progeny Cases, Boatright [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value							42
Engle Progeny Cases, M. Brown [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value							8
Engle Progeny Cases, Jordan [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value							4
Engle Progeny Cases, Jordan [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value							$ 11
Engle Progeny Cases, Pardue [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value										$ 11
Engle Progeny Cases, McKeever [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value									$ 21
Engle Progeny Cases, Boulter [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value					$ 1
Subsequent Event [Member] | Engle Progeny Cases, Cuddihee [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded											$ 3
Subsequent Event [Member] | Engle Progeny Cases, Cuddihee [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded											$ 0