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Other Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Income [Abstract]        
Rental income $ 36 $ 29 $ 103 $ 90
Gain on non-operating asset dispositions. [1] 12 3 84 97
Net periodic pension and OPEB costs 8 12 21 31
Unrelaized gain/(loss) on fair value 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
Gain (loss) on disposition of assets     $ 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.