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Other Income (Tables) | 6 Months Ended
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Jun. 30, 2021
Other Income [Abstract] |
Other Income | Other income included the following:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
Millions | 2021 | 2020 |  | 2021 | 2020
Gain on non-operating asset dispositions [a] | $ | 63 | $ | 83 |  | $ | 72 | $ | 94
Rental income |  | 34 |  | 30 |  |  | 67 |  | 61
Unrealized gain on fair value of investments (Note 13) |  | 20 |  | - |  |  | 20 |  | -
Net periodic pension and OPEB costs |  | 7 |  | 11 |  |  | 13 |  | 19
Interest income |  | 1 |  | 3 |  |  | 2 |  | 9
Non-operating environmental costs and other |  | - |  | 4 |  |  | 2 |  | 1
Total | $ | 125 | $ | 131 |  | $ | 176 | $ | 184
[a]2021 includes a $50 million gain from a sale to the Colorado Department of Transportation. 2020 includes a $69 million gain from a land and permanent easement sale to the Illinois State Toll Highway Authority.

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- Definition Tabular disclosure of the detailed components of other nonoperating income. May include methodology, assumptions and amounts for: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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