Contingencies (Health Care Cost Recovery Litigation) (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 1998 USD ($) state	Sep. 30, 2020 USD ($) claim	Sep. 30, 2019 USD ($) manufacture	Sep. 30, 2020 USD ($) claim	Sep. 30, 2019 USD ($) manufacture	Oct. 28, 2019 claim	Mar. 31, 2019 manufacture	Oct. 22, 2018 claim
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | claim						0		1
Number of states with settled litigation | state	46
State settlement agreements annual payments	$ 9,400,000,000
State settlement agreements attorney fees annual cap	$ 500,000,000
Litigation settlement		$ 1,200,000,000	$ 1,100,000,000	$ 3,300,000,000	$ 3,200,000,000
Threatened Litigation [Member] | Canada [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | claim		10		10
Canadian Tobacco Manufacturers [Member] | Canada [Member] | Smoking and Health Class Actions and Aggregated Claims Litigation [Member]
Loss Contingencies [Line Items]
Number of manufacturers | manufacture			3		3		3