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Note 7 - Income Taxes - Schedule of Deferred Income Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax liabilities:    
Property $ (12,910) $ (12,657)
Operating lease assets (411) (441)
Other (591) (534)
Total deferred income tax liabilities (13,912) (13,632)
Deferred income tax assets:    
Operating lease liabilities 401 434
Accrued casualty costs 164 157
Accrued wages 50 45
Stock compensation 26 26
Retiree benefits 0 39
Other 238 256
Total deferred income tax assets 879 957
Net deferred income tax liability $ (13,033) $ (12,675)