Investments in Equity Securities (Summary of Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Investments [Line Items]
Investments	$ 19,831	$ 19,529
ABI [Member]
Investments [Line Items]
Investments in equity securities	17,185	16,651
JUUL [Member]
Investments [Line Items]
JUUL	1,605	1,705
Cronos [Member]
Investments [Line Items]
Investments in equity securities	1,041	1,173
Equity Contract, Warrant [Member] \| Cronos [Member]
Investments [Line Items]
Derivative asset, fair value, gross asset	150	139
Equity Contract, Preemptive Rights [Member] \| Cronos [Member]
Investments [Line Items]
Derivative asset, fair value, gross asset	20	24
Common Stock [Member] \| Cronos [Member]
Investments [Line Items]
Investments in equity securities	$ 871	$ 1,010

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959

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