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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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