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Other Income | 9 Months Ended
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Sep. 30, 2021
Other Income [Abstract] |
Other Income | 6. 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 The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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