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Properties | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Properties | Properties
|  |  | Accumulated |  | Net Book |  | Depreciation
December 31, 2023 | Cost |  | Depreciation |  | Value |  | Rate (1)
| ($ in millions) |  |
Land | $ | 2,439 |  |  | $ | — |  |  | $ | 2,439 |  |  | —
Roadway: |  |  |  |  |  |  |
Rail and other track material | 8,011 |  |  | (2,006) |  |  | 6,005 |  |  | 2.41 | %
Ties | 6,205 |  |  | (1,773) |  |  | 4,432 |  |  | 3.42 | %
Ballast | 3,224 |  |  | (937) |  |  | 2,287 |  |  | 2.80 | %
Construction in process | 522 |  |  | — |  |  | 522 |  |  | —
Other roadway | 14,663 |  |  | (4,290) |  |  | 10,373 |  |  | 2.72 | %
Total roadway | 32,625 |  |  | (9,006) |  |  | 23,619 |  |  |
Equipment: |  |  |  |  |  |  |
Locomotives | 6,091 |  |  | (2,105) |  |  | 3,986 |  |  | 3.64 | %
Freight cars | 2,792 |  |  | (1,037) |  |  | 1,755 |  |  | 2.42 | %
Computers and software | 1,042 |  |  | (542) |  |  | 500 |  |  | 9.36 | %
Construction in process | 271 |  |  | — |  |  | 271 |  |  | —
Other equipment | 1,241 |  |  | (501) |  |  | 740 |  |  | 4.61 | %
Total equipment | 11,437 |  |  | (4,185) |  |  | 7,252 |  |  |
Other property | 90 |  |  | (74) |  |  | 16 |  |  | 2.48 | %
Total properties | $ | 46,591 |  |  | $ | (13,265) |  |  | $ | 33,326 |  |  |
|  |  | Accumulated |  | Net Book |  | Depreciation
December 31, 2022 | Cost |  | Depreciation |  | Value |  | Rate (1)
| ($ in millions) |  |
Land | $ | 2,405 |  |  | $ | — |  |  | $ | 2,405 |  |  | —
Roadway: |  |  |  |  |  |  |
Rail and other track material | 7,589 |  |  | (1,971) |  |  | 5,618 |  |  | 2.42 | %
Ties | 5,981 |  |  | (1,696) |  |  | 4,285 |  |  | 3.49 | %
Ballast | 3,126 |  |  | (873) |  |  | 2,253 |  |  | 2.84 | %
Construction in process | 431 |  |  | — |  |  | 431 |  |  | —
Other roadway | 14,270 |  |  | (3,948) |  |  | 10,322 |  |  | 2.69 | %
Total roadway | 31,397 |  |  | (8,488) |  |  | 22,909 |  |  |
Equipment: |  |  |  |  |  |  |
Locomotives | 5,878 |  |  | (2,060) |  |  | 3,818 |  |  | 3.66 | %
Freight cars | 2,701 |  |  | (1,033) |  |  | 1,668 |  |  | 2.51 | %
Computers and software | 926 |  |  | (476) |  |  | 450 |  |  | 9.10 | %
Construction in process | 206 |  |  | — |  |  | 206 |  |  | —
Other equipment | 1,145 |  |  | (463) |  |  | 682 |  |  | 4.51 | %
Total equipment | 10,856 |  |  | (4,032) |  |  | 6,824 |  |  |
Other property | 90 |  |  | (72) |  |  | 18 |  |  | 2.26 | %
Total properties | $ | 44,748 |  |  | $ | (12,592) |  |  | $ | 32,156 |  |  |
(1)Composite annual depreciation rate for the underlying assets, excluding the effects of the amortization of any deficiency (or excess) that resulted from our depreciation studies. Capitalized Interest Total interest cost incurred on debt was $743 million, $708 million, and $657 million during 2023, 2022 and 2021, respectively, of which $21 million, $16 million, and $11 million was capitalized during 2023, 2022 and 2021, respectively.

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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//1943274/2147480321/958-360-50-6 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//1943274/2147480321/958-360-50-1 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//1943274/2147480321/958-360-50-7 + Details
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