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Note 6 - Other Income - Schedule of Other Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Real estate income [a] [b] [1],[2] $ 103 $ 53 $ 309 $ 209
Net periodic pension benefit/(cost) 22 7 63 18
Environmental remediation and restoration (4) (4) (35) (13)
Other [a] [1] 3 (18) (3) 0
Total $ 124 $ 38 $ 334 $ 214
[1] Prior periods have been reclassified to conform to the current period financial statement presentation.
[2] The three months ended September 30, 2022, includes a $35 million gain from a sale to the Colorado Department of Transportation. The nine months ended September 30, 2022, also includes a $79 million gain from a land sale to the Illinois State Toll Highway Authority. The nine months ended September 30, 2021, includes a $50 million gain from a sale to the Colorado Department of Transportation.