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Background and Basis of Presentation (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2024	Jan. 31, 2024	Jan. 31, 2023
Horizon [Member] | PM USA [Member]
Equity, Class of Treasury Stock [Line Items]
Ownership percentage in consolidated subsidiary	75.00%	75.00%
Horizon [Member] | JTIUH [Member]
Equity, Class of Treasury Stock [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	25.00%	25.00%
January 2023 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Planned share repurchase program						$ 1,000,000,000
Repurchase of common stock (shares)			0
January 2024 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Planned share repurchase program	$ 3,400,000,000	$ 3,400,000,000			$ 1,000,000,000
Stock repurchase program, remaining authorized repurchase amount	1,000,000,000	1,000,000,000
ASR Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Planned share repurchase program	$ 2,400,000,000	$ 2,400,000,000
Repurchase of common stock (shares)	46,500,000	46,500,000
Accelerated share repurchases, percentage of stock	85.00%	85.00%
ASR Agreements [Member] | Forecast [Member]
Equity, Class of Treasury Stock [Line Items]
Accelerated share repurchases, percentage of stock				15.00%
ASR Agreements [Member] | Additional Paid-in Capital [Member]
Equity, Class of Treasury Stock [Line Items]
Accelerated share repurchases, percentage of stock	15.00%	15.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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