Segment Reporting (Narrative) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									6
Net revenues	$ 7,713	$ 7,642	$ 7,699	$ 6,751	$ 7,499	$ 7,504	$ 7,726	$ 6,896	$ 29,805	$ 29,625	$ 28,748
Asset impairment and exit costs									422
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues									29,805	29,625	28,748
Long-lived assets	8,086				7,982				8,086	7,982	8,069
Marketing Administration And Research Costs [Member]
Segment Reporting Information [Line Items]
Deconsolidation, gain (loss) amount									(239)
Indonesia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Long-lived assets	800				700				800	700	800
East Asia And Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues									5,364	5,580	6,373
Long-lived assets	829				781				829	781	659
European Union [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues									9,817	9,298	8,318
Asset impairment and exit costs									342
Long-lived assets	4,275				4,216				4,275	4,216	4,130
Eastern Europe [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues									3,282	2,921	2,711
Long-lived assets	774				547				774	547	546
Eastern Europe [Member] | The Moscow Tax Inspectorate for Major Taxpayers Audit [Member] | Other Litigation [Member]
Segment Reporting Information [Line Items]
Amount of pre-tax charge related to alleged underpayment of excise taxes and VAT claimed by tax authority, including penalties and interest									374
Canada [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member] | Smoking And Health Class Actions [Member] | RBH [Member] | Appellate Ruling [Member]
Segment Reporting Information [Line Items]
Amount of litigation charge				$ 194					194
Italy [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Long-lived assets	1,100				1,100				1,100	1,100	1,200
Switzerland [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 1,100				$ 1,000				1,100	1,000	900
Geographic Concentration Risk [Member] | Japan [Member]
Segment Reporting Information [Line Items]
Net revenues									3,900	3,800	4,700
Geographic Concentration Risk [Member] | Indonesia [Member]
Segment Reporting Information [Line Items]
Net revenues									$ 3,100	$ 3,100	$ 3,200
Customer Concentration Risk [Member] | East Asia And Australia [Member] | Customer One [Member] | Net Revenues [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									13.00%	13.00%	16.00%
Customer Concentration Risk [Member] | European Union [Member] | Customer One [Member] | Net Revenues [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									10.00%	10.00%	10.00%