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Properties | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Properties | Properties
|  |  | 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 |  |  |
|  |  | Accumulated |  | Net Book |  | Depreciation
December 31, 2021 | Cost |  | Depreciation |  | Value |  | Rate (1)
| ($ in millions) |  |
Land | $ | 2,453 |  |  | $ | — |  |  | $ | 2,453 |  |  | —
Roadway: |  |  |  |  |  |  |
Rail and other track material | 7,330 |  |  | (1,907) |  |  | 5,423 |  |  | 2.40 | %
Ties | 5,779 |  |  | (1,642) |  |  | 4,137 |  |  | 3.44 | %
Ballast | 3,041 |  |  | (818) |  |  | 2,223 |  |  | 2.79 | %
Construction in process | 339 |  |  | — |  |  | 339 |  |  | —
Other roadway | 14,111 |  |  | (3,733) |  |  | 10,378 |  |  | 2.69 | %
Total roadway | 30,600 |  |  | (8,100) |  |  | 22,500 |  |  |
Equipment: |  |  |  |  |  |  |
Locomotives | 5,695 |  |  | (1,994) |  |  | 3,701 |  |  | 3.87 | %
Freight cars | 2,701 |  |  | (1,009) |  |  | 1,692 |  |  | 2.59 | %
Computers and software | 893 |  |  | (438) |  |  | 455 |  |  | 10.34 | %
Construction in process | 164 |  |  | — |  |  | 164 |  |  | —
Other equipment | 1,088 |  |  | (420) |  |  | 668 |  |  | 4.63 | %
Total equipment | 10,541 |  |  | (3,861) |  |  | 6,680 |  |  |
Other property | 90 |  |  | (70) |  |  | 20 |  |  | 2.25 | %
Total properties | $ | 43,684 |  |  | $ | (12,031) |  |  | $ | 31,653 |  |  |
(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. Loss on Asset Disposal In 2020, we sold 703 locomotives deemed excess and no longer needed for railroad operations. We evaluated these locomotive retirements and concluded they were abnormal (see Note 1). Accordingly, we recorded a $385 million loss to adjust their carrying amount to their estimated fair value, which resulted in a $97 million tax benefit. Capitalized Interest Total interest cost incurred on debt was $708 million, $657 million, and $639 million during 2022, 2021 and 2020, respectively, of which $16 million, $11 million, and $14 million was capitalized during 2022, 2021 and 2020, 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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