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Properties (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Schedule of 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.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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