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Other Income (Tables)
 6 Months Ended
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.