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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Not Carried at Fair Value
The following table summarizes U. S. Steel’s financial assets and liabilities that were not carried at fair value at December 31, 2021 and 2020.
December 31, 2021December 31, 2020
(In millions)Fair ValueCarrying
Amount
Fair ValueCarrying
Amount
Financial liabilities:
Short-term and long-term debt (a)
$4,379 $3,702 $5,323 $4,806 
(a)Excludes finance lease obligations.