Related Parties - Equity Investments and Other: (Narrative) (Details) $ in Millions, $ in Millions						3 Months Ended		12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2025 CAD ($)	Sep. 24, 2025 USD ($)	Sep. 24, 2025 CAD ($)	Jan. 24, 2025 CAD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 31, 2024 USD ($)	May 31, 2024	Apr. 30, 2023	Mar. 22, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1,019						$ 1,005	$ 1,019	$ 1,005
Difference between equity method investment carrying value and book value	1,033						1,060	1,033	1,060
Dividends from unconsolidated subsidiaries								203	151
Deferred tax Liabilities, undistributed foreign earnings	811						495	811	495
Value of financial guarantee (up to)											$ 385
Equity method investment, other than temporary impairment						$ 146
Impairment charge								0	2,316	$ 0
Dividend income			$ 536	$ 750
Equity securities, unrealized gain								370	546
Equity securities, unrealized gain, net								289	418
Definite-Lived Intangibles And Other Assets
Schedule of Equity Method Investments [Line Items]
Difference between equity method investment carrying value and book value	161						152	161	152
Level 1
Schedule of Equity Method Investments [Line Items]
Equity securities, noncurrent	$ 1,291						921	$ 1,291	921
IPM India
Schedule of Equity Method Investments [Line Items]
Parent ownership percentage	56.30%							56.30%
TTI | PMM
Schedule of Equity Method Investments [Line Items]
Noncontrolling ownership percentage	33.00%							33.00%
Rothmans, Benson & Hedges Inc. , Imperial Tobacco Canada Limited, JTI Macdonald Corp.
Schedule of Equity Method Investments [Line Items]
Global settlement amount	$ 23,700	$ 32,500			$ 32,500
Megapolis
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 303							$ 303
Ownership interest	23.00%							23.00%
Cumulative foreign currency translation losses	$ 523							$ 523
Deferred tax Liabilities, undistributed foreign earnings							77		77
EITA
Schedule of Equity Method Investments [Line Items]
Ownership interest	49.00%							49.00%
STAEM
Schedule of Equity Method Investments [Line Items]
Ownership interest	25.00%							25.00%
STAEM | EITA
Schedule of Equity Method Investments [Line Items]
Ownership interest	51.00%							51.00%
STAEM | Management Et Developpement Des Actifs Et Des Ressources Holding (MADAR Holding)
Schedule of Equity Method Investments [Line Items]
Ownership interest	49.00%							49.00%
UTC
Schedule of Equity Method Investments [Line Items]
Ownership interest													25.00%
Eastern
Schedule of Equity Method Investments [Line Items]
Ownership interest												14.70%
RBH
Schedule of Equity Method Investments [Line Items]
Impairment charge							2,316		2,316
Equity securities			$ 567											$ 3,280
Income from equity securities without readily determinable fair value						$ 303
RBH | Level 3
Schedule of Equity Method Investments [Line Items]
Equity securities							$ 714		$ 714
Wellness, Investment Of Certain Companies
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 41							$ 41