v3.25.4
Segment information - Summary of Information by Geographical Area (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of geographical areas [line items]      
Third-party revenue, by origin $ 266,886 $ 284,312 $ 316,620
Goodwill, other intangible assets, property, plant and equipment, joint ventures and associates at December 31 239,524 234,176 246,205
Europe      
Disclosure of geographical areas [line items]      
Third-party revenue, by origin 91,808 92,480 118,135
Goodwill, other intangible assets, property, plant and equipment, joint ventures and associates at December 31 46,689 40,971 48,008
Asia, Oceania, Africa      
Disclosure of geographical areas [line items]      
Third-party revenue, by origin 90,838 98,343 99,967
Goodwill, other intangible assets, property, plant and equipment, joint ventures and associates at December 31 89,236 88,588 91,374
USA      
Disclosure of geographical areas [line items]      
Third-party revenue, by origin 57,728 65,089 70,291
Goodwill, other intangible assets, property, plant and equipment, joint ventures and associates at December 31 53,899 55,245 57,261
Other Americas      
Disclosure of geographical areas [line items]      
Third-party revenue, by origin 26,512 28,400 28,227
Goodwill, other intangible assets, property, plant and equipment, joint ventures and associates at December 31 49,700 49,372 49,562
UK      
Disclosure of geographical areas [line items]      
Third-party revenue, by origin 28,746 28,011 44,815
Goodwill, other intangible assets, property, plant and equipment, joint ventures and associates at December 31 $ 19,997   $ 21,478
Goodwill, other intangible assets, property, plant and equipment, joint ventures and associates excluding assets reclassified as held for sale   $ 15,822