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Other Income (Tables) | 9 Months Ended
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Sep. 30, 2021
Other Income [Abstract] |
Other Income | Other income included the following:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
Millions | 2021 | 2020 |  | 2021 | 2020
Rental income | $ | 36 | $ | 29 |  | $ | 103 | $ | 90
Gain on non-operating asset dispositions [a] |  | 12 |  | 3 |  |  | 84 |  | 97
Net periodic pension and OPEB costs |  | 8 |  | 12 |  |  | 21 |  | 31
Unrealized gain/(loss) on fair value of investments (Note 13) |  | (12) |  | - |  |  | 8 |  | -
Interest income |  | 2 |  | 2 |  |  | 4 |  | 11
Non-operating environmental costs and other |  | (8) |  | (9) |  |  | (6) |  | (8)
Total | $ | 38 | $ | 37 |  | $ | 214 | $ | 221
[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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