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Background and Basis of Presentation (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	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)			10.4		10.4
January 2024 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Planned share repurchase program		$ 3,400,000,000				$ 1,000,000,000.0
Repurchase of common stock (shares)	7.6			54.1
Stock repurchase program, remaining authorized repurchase amount	$ 990,000,000			$ 990,000,000
ASR Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Planned share repurchase program		$ 2,400,000,000
Repurchase of common stock (shares)	7.4	46.5		53.9
Accelerated share repurchases, percentage of stock	85.00%			85.00%

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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