Contingencies (Engle Progeny Cases Trial Results - Pending and Concluded) (Details) - USD ($) $ in Millions	1 Months Ended							3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	Jan. 31, 2019	Oct. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	May 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Feb. 28, 2019	Jul. 31, 2018	Jun. 30, 2018	Feb. 28, 2018	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Sep. 30, 2015	Jul. 31, 2015	Jan. 31, 2015	Oct. 31, 2014	Sep. 30, 2014	Jul. 31, 2014
Loss Contingencies [Line Items]
Loss contingency accrual, payments								$ 109		$ 23
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, McCall [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded		$ 1						1
Engle Progeny Cases, McCall [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded		1						1
Engle Progeny Cases, Neff [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded		4						4
Engle Progeny Cases, Neff [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded		2						2
Engle Progeny Cases, Frogel [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded		1						1
Engle Progeny Cases, Frogel [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded		1						1
Punitive damages awarded		0						$ 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
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, 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, Gloger [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded														$ 8
Engle Progeny Cases, Gloger [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded														$ 5
Engle Progeny Cases, Bryant [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded															$ 1
Engle Progeny Cases, Bryant [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded															$ 1
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, Wallace [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																	$ 12
Engle Progeny Cases, Wallace [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded																	$ 16
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, McCoy [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																					$ 2
Engle Progeny Cases, McCoy [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded																					1
Punitive damages awarded																					$ 3
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, Danielson [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		3
Engle Progeny Cases, S. Martin [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		5
Engle Progeny Cases, Searcy [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		2
Engle Progeny Cases, Boatright [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		42
Engle Progeny Cases, M. Brown [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		8
Engle Progeny Cases, Jordan [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		11
Engle Progeny Cases, Pardue [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		11
Engle Progeny Cases, McKeever [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments		$ 21
Engle Progeny Cases, Boulter [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments			$ 1
Engle Progeny Cases, Simon [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments				$ 1
Engle Progeny Cases, Perrotto [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments					1
Engle Progeny Cases, Gore [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments					1
Engle Progeny Cases, Putney [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments					$ 5
Engle Progeny Cases, Sermons [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments						$ 1
Engle Progeny Cases, Tognoli [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							1
Engle Progeny Cases, Howles [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							6
Engle Progeny Cases, Purdo [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							10
Engle Progeny Cases, Griffin [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							1
Engle Progeny Cases, Ledoux [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							20
Engle Progeny Cases, Burkhart [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							2
Engle Progeny Cases, Barbose [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							12
Engle Progeny Cases, Allen [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							10
Engle Progeny Cases, Ahrens [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments							$ 7
Subsequent Event [Member] | Engle Progeny Cases, J. Brown [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments	$ 4
Subsequent Event [Member] | Engle Progeny Cases, L. Martin [Member] | Settled Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, payments	$ 2