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Other Income | 12 Months Ended
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Dec. 31, 2020
Other Income [Abstract] |
Other Income | 6. 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 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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