Segment Reporting (Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended								12 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, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 7,713	$ 7,642	$ 7,699	$ 6,751	$ 7,499	$ 7,504	$ 7,726	$ 6,896	$ 29,805	$ 29,625	$ 28,748
Operating income									10,531	11,377	11,581
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues									29,805	29,625	28,748
Operating income									10,531	11,377	11,581
Operating Segments [Member] | European Union [Member]
Segment Reporting Information [Line Items]
Net revenues									9,817	9,298	8,318
Operating income									3,970	4,105	3,691
Operating Segments [Member] | Eastern Europe [Member]
Segment Reporting Information [Line Items]
Net revenues									3,282	2,921	2,711
Operating income									547	902	887
Operating Segments [Member] | Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Net revenues									4,042	4,114	3,988
Operating income									1,684	1,627	1,884
Operating Segments [Member] | South & Southeast Asia [Member]
Segment Reporting Information [Line Items]
Net revenues									5,094	4,656	4,417
Operating income									2,163	1,747	1,514
Operating Segments [Member] | East Asia And Australia [Member]
Segment Reporting Information [Line Items]
Net revenues									5,364	5,580	6,373
Operating income									1,932	1,851	2,608
Operating Segments [Member] | Latin America & Canada [Member]
Segment Reporting Information [Line Items]
Net revenues									2,206	3,056	2,941
Operating income									235	1,145	997
Operating Segments [Member] | Combustible Products [Member]
Segment Reporting Information [Line Items]
Net revenues									24,218	25,529	25,107
Operating Segments [Member] | Combustible Products [Member] | European Union [Member]
Segment Reporting Information [Line Items]
Net revenues									8,093	8,433	8,048
Operating Segments [Member] | Combustible Products [Member] | Eastern Europe [Member]
Segment Reporting Information [Line Items]
Net revenues									2,438	2,597	2,657
Operating Segments [Member] | Combustible Products [Member] | Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Net revenues									3,721	3,732	3,893
Operating Segments [Member] | Combustible Products [Member] | South & Southeast Asia [Member]
Segment Reporting Information [Line Items]
Net revenues									5,094	4,656	4,417
Operating Segments [Member] | Combustible Products [Member] | East Asia And Australia [Member]
Segment Reporting Information [Line Items]
Net revenues									2,693	3,074	3,156
Operating Segments [Member] | Combustible Products [Member] | Latin America & Canada [Member]
Segment Reporting Information [Line Items]
Net revenues									2,179	3,037	2,937
Operating Segments [Member] | Reduced-Risk Products [Member]
Segment Reporting Information [Line Items]
Net revenues									5,587	4,096	3,640
Operating Segments [Member] | Reduced-Risk Products [Member] | European Union [Member]
Segment Reporting Information [Line Items]
Net revenues									1,724	865	269
Operating Segments [Member] | Reduced-Risk Products [Member] | Eastern Europe [Member]
Segment Reporting Information [Line Items]
Net revenues									844	324	55
Operating Segments [Member] | Reduced-Risk Products [Member] | Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Net revenues									321	382	94
Operating Segments [Member] | Reduced-Risk Products [Member] | South & Southeast Asia [Member]
Segment Reporting Information [Line Items]
Net revenues									0	0	0
Operating Segments [Member] | Reduced-Risk Products [Member] | East Asia And Australia [Member]
Segment Reporting Information [Line Items]
Net revenues									2,671	2,506	3,218
Operating Segments [Member] | Reduced-Risk Products [Member] | Latin America & Canada [Member]
Segment Reporting Information [Line Items]
Net revenues									$ 27	$ 19	$ 4