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Other Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Income [Abstract] |
Other Income | Other income included the following for the years ended December 31:
Millions | 2020 | 2019 | 2018
Rental income | $ | 123 | $ | 124 | $ | 122
Net gain on non-operating asset dispositions [a] |  | 115 |  | 20 |  | 30
Net periodic pension and OPEB costs |  | 44 |  | 37 |  | 13
Interest income |  | 12 |  | 32 |  | 30
Interest income on employment tax refund |  | - |  | 31 |  | -
Early extinguishment of debt |  | - |  | (2) |  | (85)
Non-operating environmental costs and other |  | (7) |  | 1 |  | (16)
Total | $ | 287 | $ | 243 | $ | 94
[a]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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