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Note 7 - Income Taxes - Schedule of Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax liabilities: |  |
Property | $ (12,657) | $ (12,474)
Operating lease assets | (441) | (397)
Other | (534) | (444)
Total deferred income tax liabilities | (13,632) | (13,315)
Deferred income tax assets: |  |
Operating lease liabilities | 434 | 396
Accrued casualty costs | 157 | 143
Accrued wages | 45 | 40
Retiree benefits | 39 | 255
Stock compensation | 26 | 26
Other | 256 | 208
Total deferred income tax assets | 957 | 1,068
Net deferred income tax liability | $ (12,675) | $ (12,247)

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