Segment Reporting (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			6
Total PMI net revenues	$ 7,699	$ 7,726	$ 14,450	$ 14,622
Operating income	3,187	3,093	5,237	5,519
Asset impairment and exit costs	23	0	43	0
Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	6,233	6,706		12,475
Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	1,466	1,020	2,709	2,147
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues			14,450
Operating income			5,237	5,519
Operating Segments [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues			11,741
Operating Segments [Member] | European Union [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	2,577	2,503	4,736	4,491
Operating income	1,195	1,177	2,091	1,917
Operating Segments [Member] | European Union [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	2,149	2,321	3,961	4,157
Operating Segments [Member] | European Union [Member] | Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	428	182	775	334
Operating Segments [Member] | Eastern Europe [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	822	760	1,401	1,327
Operating income	256	261	385	412
Operating Segments [Member] | Eastern Europe [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	640	695	1,110	1,222
Operating Segments [Member] | Eastern Europe [Member] | Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	182	65	291	105
Operating Segments [Member] | Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	1,004	1,022	1,931	1,983
Operating income	441	403	785	777
Operating Segments [Member] | Middle East And Africa [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	918	910	1,746	1,794
Operating Segments [Member] | Middle East And Africa [Member] | Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	86	112	185	189
Operating Segments [Member] | South And Southeast Asia [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	1,248	1,156	2,361	2,237
Operating income	492	440	932	869
Operating Segments [Member] | South And Southeast Asia [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	1,248	1,156	2,361	2,237
Operating Segments [Member] | South And Southeast Asia [Member] | Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	0	0	0	0
Operating Segments [Member] | East Asia And Australia [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	1,521	1,478	2,842	3,069
Operating income	642	498	1,069	1,013
Operating Segments [Member] | East Asia And Australia [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	756	822	1,394	1,559
Operating Segments [Member] | East Asia And Australia [Member] | Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	765	656	1,448	1,510
Operating Segments [Member] | Latin America & Canada [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	527	807	1,179	1,515
Operating income	161	314	(25)	531
Operating Segments [Member] | Latin America & Canada [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	522	802	1,168	1,506
Operating Segments [Member] | Latin America & Canada [Member] | Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Total PMI net revenues	$ 5	$ 5	11	$ 9
Smoking And Health Class Actions [Member] | RBH [Member] | Appellate Ruling [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member]
Segment Reporting Information [Line Items]
Amount of litigation charge			194
Marketing Administration And Research Costs [Member]
Segment Reporting Information [Line Items]
Deconsolidation amount			$ 239