Contingencies (Health Care Cost Recovery Litigation) (Details) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 1998 USD ($) state	Mar. 31, 2021 USD ($) case manufacture	Mar. 31, 2020 USD ($)	Apr. 27, 2020 claim	Dec. 31, 2019 manufacture	Apr. 22, 2019 claim
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | claim				1		1
Number of states with settled litigation | state	46
State settlement agreements annual payments	$ 9,400
State settlement agreements attorney fees annual cap	$ 500
Litigation settlement		$ 900	$ 1,100
Threatened Litigation [Member] | Canada [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | case		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