Investments in Equity Securities (Investment in JUUL Narrative) (Details)		1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 28, 2020 USD ($) director	Dec. 31, 2018 USD ($)	Sep. 30, 2020 USD ($) director	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) director	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2020
Schedule of Equity Method Investments [Line Items]
Impairment of JUUL equity securities | $			$ 2,600,000,000		$ 4,500,000,000	$ 2,600,000,000	$ 4,500,000,000
JUUL [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity securities | $		$ 12,800,000,000
Equity securities, ownership percentage		35.00%	35.00%	35.00%		35.00%		35.00%	35.00%
Equity securities without readily determinable fair value, amount | $			$ 1,605,000,000	$ 4,205,000,000		$ 1,605,000,000		$ 4,205,000,000
Equity securities without readily determinable fair value, non-compete release trigger period	12 months
Equity securities without readily determinable fair value, non-compete release trigger percentage of investment carrying value	10.00%
Equity securities without readily determinable fair value, quantitative assessment adjustment, annual amount | $	$ 12,800,000,000
Equity securities without readily determinable fair value, no litigation period	1 year
Equity securities without readily determinable fair value, number of board members			7			7
Equity securities without readily determinable fair value, number of board members upon share conversion	9
Equity securities without readily determinable fair value, number of independent board members upon share conversion	3
Equity securities without readily determinable fair value, number of board members appointed by investor upon share conversion	1
Equity securities without readily determinable fair value, number of board members appointed by investee stockholders upon share conversion	2
Equity securities without readily determinable fair value, number of investor nominating committee designees upon share conversion	1
Equity securities without readily determinable fair value, number of directors designated by investor upon share conversion	2
Equity securities without readily determinable fair value, number of nominating committee directors designated by investee upon share conversion	3
Equity securities without readily determinable fair value, number of oversight committee directors designated by investor upon share conversion	2
Equity securities without readily determinable fair value, number of oversight committee chair directors designated by investor upon share conversion	1
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount | $			$ 0			$ 0
Impairment of JUUL equity securities | $				$ 4,100,000,000	$ 4,500,000,000	$ 2,600,000,000		$ 8,600,000,000