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Other Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income [Abstract]      
Rental income $ 123 $ 124 $ 122
Net gain on non-operating asset dispositions. 115 [1] 20 30
Net periodic pension and OPEB costs 44 37 13
Interest income 12 32 30
Interest income due to employment tax refund   31  
Early extinguishment of debt   (2) (85)
Non-operating environmental costs and other (7) 1 (16)
Total 287 $ 243 $ 94
Land and permanent easement sale $ 69    
[1] 2020 includes a $69 million gain from a land and permanent easement sale to the Illinois State Toll Highway Authority.