Contingencies (Health Care Cost Recovery Litigation) (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 1998 USD ($) state	Jun. 30, 2020 USD ($) case	Jun. 30, 2019 USD ($) manufacture	Jun. 30, 2020 USD ($) case	Jul. 26, 2019 case	Mar. 31, 2019 manufacture	Jul. 23, 2018 case
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | case					1		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		$ 1,000,000,000.0	$ 1,200,000,000	$ 2,100,000,000
Threatened Litigation [Member] | Canada [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | case		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