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Other Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Income [Abstract]        
Gain on non-operating asset dispositions. [1] $ 63 $ 83 $ 72 $ 94
Rental income 34 30 67 61
Unrelaized gain on fair value 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
Gain (loss) on disposition of assets $ 50 $ 69 $ 50 $ 69
[1] 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.