Acquisitions and Divestitures: (Narrative) (Details) £ in Millions, $ in Millions			1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	May 31, 2024 USD ($)	Dec. 31, 2025 USD ($) business	Sep. 30, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2025 GBP (£)	Dec. 31, 2024 GBP (£)	Jul. 14, 2023 USD ($)	Apr. 30, 2023	Oct. 20, 2022 USD ($)
Business Combination [Line Items]
Upfront cash consideration						$ 30	$ 136	$ 191
Loss on sale, including tax costs						94	206	0
Cumulative foreign currency translation losses						3	171	$ 12
UTC
Business Combination [Line Items]
Ownership interest												25.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sale Of One Business
Business Combination [Line Items]
Number of businesses sold | business				1
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Vectura Group Ltd.
Business Combination [Line Items]
Pre tax loss on sale							$ 199
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]							Marketing, administration and research costs (Notes 3, 4, 11 & 18)
Upfront cash consideration	$ 191	£ 152
Short term receivable	$ 30						$ 30			£ 24
Deferred payments (up to)				$ 127		127			£ 101
Loss on sale, including tax costs							206
Impairment charge on disposal group					$ 198
Disposal Group, Not Discontinued Operations | Sale Of One Business And Certain Other Businesses
Business Combination [Line Items]
Pre tax loss on sale				$ 94
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]				Marketing, administration and research costs (Notes 3, 4, 11 & 18)
Disposal Group, Held-for-Sale, Not Discontinued Operations | Certain Other Businesses
Business Combination [Line Items]
Disposal group assets				$ 142		142
Disposal group liabilities				59		$ 59
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sale Of One Business
Business Combination [Line Items]
Reclassification of currency translation losses from other comprehensive losses				$ 3
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Vectura Group Ltd.
Business Combination [Line Items]
Reclassification of currency translation losses from other comprehensive losses							$ 16
Altria Group
Business Combination [Line Items]
Commercial agreement, total cash consideration													$ 2,800
Commercial agreement, initial payment													$ 1,000
Commercial agreement, payment											$ 1,800
Altria Group | Other Intangible Assets
Business Combination [Line Items]
Useful life						5 years	5 years
EIH
Business Combination [Line Items]
Interest acquired												66.73%
UTC
Business Combination [Line Items]
Percentage of indirect economic interest			54.25%
Book value of investment			$ 312
Cumulative foreign currency translation losses			112
Total purchase price for the incremental equity interest			316
Payments to acquire noncontrolling interests			31
Payment for contingent consideration liability					22
Payment of assumed bank loans					$ 240
UTC | Contingent Consideration
Business Combination [Line Items]
Liabilities incurred			22
UTC | Borrowings
Business Combination [Line Items]
Liabilities incurred			$ 263