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Properties | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Properties | Properties
|  |  | Accumulated |  | Net Book |  | Depreciation
December 31, 2020 | Cost |  | Depreciation |  | Value |  | Rate (1)
| ($ in millions) |  |
Land | $ | 2,394 |  |  | $ | — |  |  | $ | 2,394 |  |  | —
Roadway: |  |  |  |  |  |  |
Rail and other track material | 7,153 |  |  | (1,892) |  |  | 5,261 |  |  | 2.35 | %
Ties | 5,685 |  |  | (1,601) |  |  | 4,084 |  |  | 3.41 | %
Ballast | 2,973 |  |  | (774) |  |  | 2,199 |  |  | 2.76 | %
Construction in process | 297 |  |  | — |  |  | 297 |  |  | —
Other roadway | 14,320 |  |  | (3,926) |  |  | 10,394 |  |  | 2.71 | %
Total roadway | 30,428 |  |  | (8,193) |  |  | 22,235 |  |  |
Equipment: |  |  |  |  |  |  |
Locomotives | 5,478 |  |  | (1,911) |  |  | 3,567 |  |  | 3.56 | %
Freight cars | 2,780 |  |  | (1,023) |  |  | 1,757 |  |  | 2.59 | %
Computers and software | 732 |  |  | (391) |  |  | 341 |  |  | 9.86 | %
Construction in process | 333 |  |  | — |  |  | 333 |  |  | —
Other equipment | 1,094 |  |  | (399) |  |  | 695 |  |  | 4.70 | %
Total equipment | 10,417 |  |  | (3,724) |  |  | 6,693 |  |  |
Other property | 91 |  |  | (68) |  |  | 23 |  |  | 2.24 | %
Total properties | $ | 43,330 |  |  | $ | (11,985) |  |  | $ | 31,345 |  |  |
|  |  | Accumulated |  | Net Book |  | Depreciation
December 31, 2019 | Cost |  | Depreciation |  | Value |  | Rate (1)
| ($ in millions) |  |
Land | $ | 2,385 |  |  | $ | — |  |  | $ | 2,385 |  |  | —
Roadway: |  |  |  |  |  |  |
Rail and other track material | 7,024 |  |  | (1,905) |  |  | 5,119 |  |  | 2.30 | %
Ties | 5,536 |  |  | (1,496) |  |  | 4,040 |  |  | 3.37 | %
Ballast | 2,868 |  |  | (723) |  |  | 2,145 |  |  | 2.72 | %
Construction in process | 360 |  |  | — |  |  | 360 |  |  | —
Other roadway | 14,261 |  |  | (3,786) |  |  | 10,475 |  |  | 2.71 | %
Total roadway | 30,049 |  |  | (7,910) |  |  | 22,139 |  |  |
Equipment: |  |  |  |  |  |  |
Locomotives | 5,973 |  |  | (2,112) |  |  | 3,861 |  |  | 3.66 | %
Freight cars | 2,988 |  |  | (1,148) |  |  | 1,840 |  |  | 2.45 | %
Computers and software | 732 |  |  | (355) |  |  | 377 |  |  | 9.68 | %
Construction in process | 291 |  |  | — |  |  | 291 |  |  | —
Other equipment | 1,082 |  |  | (388) |  |  | 694 |  |  | 4.89 | %
Total equipment | 11,066 |  |  | (4,003) |  |  | 7,063 |  |  |
Other property | 96 |  |  | (69) |  |  | 27 |  |  | 1.05 | %
Total properties | $ | 43,596 |  |  | $ | (11,982) |  |  | $ | 31,614 |  |  |
(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. In 2020, we sold $88 million of natural resource assets that were included in “Other current assets” on the Consolidated Balance Sheet at December 31, 2019. We recorded a $49 million impairment loss in 2019 related to these assets, which is reflected in “Gains and losses on properties” in the Consolidated Statement of Cash Flows for the year ended December 31, 2019. 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 $639 million, $620 million, and $574 million during 2020, 2019 and 2018, respectively, of which $14 million, $16 million, and $17 million was capitalized during 2020, 2019 and 2018, 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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://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 http://asc.fasb.org/extlink&oid=120429125&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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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