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Property, plant and equipment (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Insurance and Other [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 61,352 $ 58,711
Property, plant and equipment, accumulated depreciation (30,616) (28,640)
Total property, plant and equipment, net 30,736 30,071
Insurance and Other [Member] | Land, buildings and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 21,612 20,735
Insurance and Other [Member] | Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 33,611 32,475
Insurance and Other [Member] | Furniture, fixtures and other [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 6,129 5,501
Railroad [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 93,790 91,672
Property, plant and equipment, accumulated depreciation (21,965) (20,411)
Total property, plant and equipment, net 71,825 71,261
Railroad [Member] | Land, track structure and other roadway [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 75,996 74,093
Railroad [Member] | Locomotives, freight cars and other equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 15,591 15,766
Railroad [Member] | Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,203 1,813
Utilities and Energy [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 154,861 146,885
Property, plant and equipment, accumulated depreciation (45,107) (43,116)
Total property, plant and equipment, net 109,754 103,769
Utilities and Energy [Member] | Utility generation, transmission and distribution systems [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 106,751 103,015
Utilities and Energy [Member] | Interstate natural gas pipeline assets [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 20,646 20,237
Utilities and Energy [Member] | Independent power plants and other [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 15,619 14,840
Utilities and Energy [Member] | Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 11,845 8,793
Railroad, Utilities and Energy [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment, net $ 181,579 $ 175,030