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Property, plant and equipment including equipment held for lease | 6 Months Ended
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Jun. 30, 2024
Property, plant and equipment including equipment held for lease | Note 11. Property, plant and equipment A summary of property, plant and equipment of our insurance and other businesses follows (in millions).
|  | June 30, 2024 |  |  | December 31, 2023 |
Land, buildings and improvements |  | $ | 15,277 |  |  | $ | 15,058 |
Machinery and equipment |  |  | 28,483 |  |  |  | 28,010 |
Furniture, fixtures and other |  |  | 5,685 |  |  |  | 5,566 |
|  |  | 49,445 |  |  |  | 48,634 |
Accumulated depreciation |  |  | (27,301 | ) |  |  | (26,604 | )
|  | $ | 22,144 |  |  | $ | 22,030 |
A summary of property, plant and equipment of our railroad and utilities and energy businesses follows (in millions). The utility generation, transmission and distribution systems and interstate natural gas pipeline assets are owned by regulated public utility and natural gas pipeline subsidiaries.
|  | June 30, 2024 |  |  | December 31, 2023 |
Railroad: |  |  |  |  |  |
Land, track structure and other roadway |  | $ | 72,725 |  |  | $ | 71,692 |
Locomotives, freight cars and other equipment |  |  | 16,461 |  |  |  | 16,256 |
Construction in progress |  |  | 1,863 |  |  |  | 1,715 |
|  |  | 91,049 |  |  |  | 89,663 |
Accumulated depreciation |  |  | (20,401 | ) |  |  | (19,464 | )
|  |  | 70,648 |  |  |  | 70,199 |
Utilities and energy: |  |  |  |  |  |
Utility generation, transmission and distribution systems |  |  | 97,682 |  |  |  | 96,195 |
Interstate natural gas pipeline assets |  |  | 19,603 |  |  |  | 19,226 |
Independent power plants and other |  |  | 14,891 |  |  |  | 14,781 |
Land, buildings and improvements |  |  | 4,719 |  |  |  | 4,540 |
Machinery, equipment and other |  |  | 4,040 |  |  |  | 3,855 |
Construction in progress |  |  | 10,849 |  |  |  | 9,551 |
|  |  | 151,784 |  |  |  | 148,148 |
Accumulated depreciation |  |  | (42,525 | ) |  |  | (40,731 | )
|  |  | 109,259 |  |  |  | 107,417 |
|  | $ | 179,907 |  |  | $ | 177,616 |
Depreciation expense for the first six months of 2024 and 2023 is summarized below (in millions).
|  | First Six Months |
|  | 2024 |  |  | 2023 |
Insurance and other |  | $ | 1,226 |  |  | $ | 1,158 |
Railroad, utilities and energy |  |  | 3,553 |  |  |  | 3,494 |
|  | $ | 4,779 |  |  | $ | 4,652 |
Equipment held for lease [Member] |
Property, plant and equipment including equipment held for lease | Note 12. Equipment held for lease Equipment held for lease includes railcars, aircraft and other equipment, including over-the-road trailers, intermodal tank containers, cranes, storage units and furniture. Equipment held for lease is summarized below (in millions).
| June 30, 2024 |  |  | December 31, 2023 |
Railcars | $ | 10,148 |  |  | $ | 10,031 |
Aircraft |  | 13,340 |  |  |  | 12,537 |
Other |  | 5,683 |  |  |  | 5,576 |
|  | 29,171 |  |  |  | 28,144 |
Accumulated depreciation |  | (11,753 | ) |  |  | (11,197 | )
| $ | 17,418 |  |  | $ | 16,947 |
Depreciation expense for equipment held for lease in the first six months was $695 million in 2024 and $623 million in 2023. Fixed and variable operating lease revenues for the second quarter and first six months of 2024 and 2023 are summarized below (in millions).
| Second Quarter |  |  | First Six Months |
| 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Fixed lease revenue | $ | 1,612 |  |  | $ | 1,478 |  |  | $ | 3,164 |  |  | $ | 2,895 |
Variable lease revenue |  | 696 |  |  |  | 601 |  |  |  | 1,366 |  |  |  | 1,228 |
| $ | 2,308 |  |  | $ | 2,079 |  |  | $ | 4,530 |  |  | $ | 4,123 |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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