Contingencies: (Other Litigation) (Details) € in Millions, R$ in Millions, $ in Millions								1 Months Ended	2 Months Ended	6 Months Ended	14 Months Ended
	Nov. 24, 2025 patent	Mar. 31, 2025 USD ($)	Mar. 31, 2025 BRL (R$)	Dec. 03, 2024 USD ($)	Dec. 03, 2024 BRL (R$)	Sep. 22, 2021 EUR (€)	Sep. 22, 2021 USD ($)	Jul. 31, 2020 defendant	Aug. 31, 2024 patent	Jul. 31, 2025 patent	Dec. 31, 2025 patent
Public Prosecutor's Office Of Rome, Italy Vs. Philip Morris Italia S.r.l.
Loss Contingencies [Line Items]
Number of defendants | defendant								3
British American Tobacco p.l.c Vs. Philip Morris Italia S.r.l.
Loss Contingencies [Line Items]
Loss contingency, damages sought, value						€ 50	$ 59
Brazilian Tax Authority
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 41	R$ 211	$ 27	R$ 137
Future Technology K.K. vs. Sojitz Corporation
Loss Contingencies [Line Items]
Number of patents allegedly infringed									2	8	12
Number of patents allegedly infringed not entitled to a preliminary injunction	1