Goodwill and Other Intangible Assets, net (Narrative) (Details)	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) d	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Loss Contingencies [Line Items]
Amortization of intangible assets	$ 38,000,000		$ 38,000,000		$ 112,000,000	$ 102,000,000	$ 139,000,000
Goodwill, accumulated impairment loss	873,000,000				873,000,000		0
Impairment of goodwill	0		$ 0		873,000,000	0	0
Goodwill	6,072,000,000				6,072,000,000		6,945,000,000	$ 6,791,000,000
Other Intangible Assets, net	$ 12,866,000,000				$ 12,866,000,000		$ 12,973,000,000	$ 13,686,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | IQOS Tobacco Heating System [Member]
Loss Contingencies [Line Items]
Disposal group, gain (loss) on disposal						2,700,000,000
E-vapor [Member]
Loss Contingencies [Line Items]
Percentage exceeded over carrying value							28.00%
Amount over carrying value							$ 300,000,000
Impairment of goodwill		$ 873,000,000
Goodwill		$ 895,000,000
E-vapor [Member] | E-vapor Cases [Member]
Loss Contingencies [Line Items]
Number of days to review | d					60
Skoal [Member]
Loss Contingencies [Line Items]
Asset impairment charges				$ 354,000,000		$ 354,000,000
Other Intangible Assets, net				$ 3,600,000,000
Weighted Average
Loss Contingencies [Line Items]
Finite-lived intangible asset, useful life	19 years				19 years
MST and snus [Member]
Loss Contingencies [Line Items]
Indefinite-lived trademarks	$ 8,500,000,000				$ 8,500,000,000
MST and snus [Member] | Copenhagen [Member]
Loss Contingencies [Line Items]
Indefinite-lived trademarks	4,000,000,000.0				4,000,000,000.0
MST and snus [Member] | Skoal [Member]
Loss Contingencies [Line Items]
Indefinite-lived trademarks	3,600,000,000				3,600,000,000
MST and snus [Member] | Other [Member]
Loss Contingencies [Line Items]
Indefinite-lived trademarks	900,000,000				900,000,000
Middleton [Member]
Loss Contingencies [Line Items]
Indefinite-lived trademarks	$ 2,600,000,000				$ 2,600,000,000