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Property, plant and equipment (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Insurance and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 48,634 | $ 46,298
Property, plant and equipment, accumulated depreciation | (26,604) | (25,185)
Total property, plant and equipment, net | 22,030 | 21,113
Insurance and Other [Member] | Machinery and equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 28,010 | 26,690
Insurance and Other [Member] | Furniture, fixtures and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 5,566 | 4,847
Insurance and Other [Member] | Land, buildings and improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 15,058 | 14,761
Railroad [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 89,663 | 85,124
Property, plant and equipment, accumulated depreciation | (19,464) | (17,899)
Total property, plant and equipment, net | 70,199 | 67,225
Railroad [Member] | Land, track structure and other roadway [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 71,692 | 67,350
Railroad [Member] | Locomotives, freight cars and other equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 16,256 | 16,031
Railroad [Member] | Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 1,715 | 1,743
Utilities and Energy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 148,148 | 131,094
Property, plant and equipment, accumulated depreciation | (40,731) | (38,051)
Total property, plant and equipment, net | 107,417 | 93,043
Utilities and Energy [Member] | Utility generation, transmission and distribution systems [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 96,195 | 92,759
Utilities and Energy [Member] | Interstate natural gas pipeline assets [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 19,226 | 18,328
Utilities and Energy [Member] | Independent power plants and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 14,781 | 14,650
Utilities and Energy [Member] | Land, buildings and improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 4,540 |
Utilities and Energy [Member] | Machinery, equipment, and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 3,855 |
Utilities and Energy [Member] | Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 9,551 | 5,357
Railroad, Utilities and Energy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, net | $ 177,616 | $ 160,268

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