Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Investments in Equity Securities (Earnings from Equity Investments) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments [Line Items]
Income (losses) from investments under equity method of accounting					$ (211)	$ 1,725	$ 890
Income (losses) from equity investments					(111)	1,725	890
ABI [Member]
Investments [Line Items]
Income (losses) from investments under equity method of accounting					(223)	1,229	890
Cronos [Member]
Investments [Line Items]
Income (losses) from investments under equity method of accounting					12	496	0
JUUL [Member]
Investments [Line Items]
Income (losses) from investments under fair value option	$ 100	$ 0	$ 0	$ 0	$ 100	$ 0	$ 0