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Property, plant and equipment (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Insurance and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 48,977 | $ 48,634
Property, plant and equipment, accumulated depreciation | (26,919) | (26,604)
Total property, plant and equipment, net | 22,058 | 22,030
Insurance and Other [Member] | Land, buildings and improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 15,157 | 15,058
Insurance and Other [Member] | Machinery and equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 28,247 | 28,010
Insurance and Other [Member] | Furniture, fixtures and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 5,573 | 5,566
Railroad [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 90,229 | 89,663
Property, plant and equipment, accumulated depreciation | (19,963) | (19,464)
Total property, plant and equipment, net | 70,266 | 70,199
Railroad [Member] | Land, track structure and other roadway [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 72,194 | 71,692
Railroad [Member] | Locomotives, freight cars and other equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 16,383 | 16,256
Railroad [Member] | Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 1,652 | 1,715
Utilities and Energy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 149,585 | 148,148
Property, plant and equipment, accumulated depreciation | (41,563) | (40,731)
Total property, plant and equipment, net | 108,022 | 107,417
Utilities and Energy [Member] | Land, buildings and improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 4,602 | 4,540
Utilities and Energy [Member] | Machinery, equipment and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 3,928 | 3,855
Utilities and Energy [Member] | Utility generation, transmission and distribution systems [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 96,675 | 96,195
Utilities and Energy [Member] | Interstate natural gas pipeline assets [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 19,357 | 19,226
Utilities and Energy [Member] | Independent power plants and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 14,830 | 14,781
Utilities and Energy [Member] | Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 10,193 | 9,551
Railroad, Utilities and Energy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, net | $ 178,288 | $ 177,616

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