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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES
NOTE 6 - GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES
GOODWILL
The following is a summary of Goodwill by segment:
(In millions)March 31,
2024		December 31,
2023
Steelmaking$956 $956 
Other Businesses49 49 
Total goodwill$1,005 $1,005 
INTANGIBLE ASSETS AND LIABILITIES
The following is a summary of our intangible assets and liabilities:
March 31, 2024
December 31, 2023
(In millions)Gross AmountAccumulated AmortizationNet AmountGross AmountAccumulated AmortizationNet Amount
Intangible assets1:
Customer relationships$90 $(20)$70 $90 $(18)$72 
Developed technology60 (15)45 60 (14)46 
Trade names and trademarks18 (5)13 18 (5)13 
Mining permits72 (28)44 72 (28)44 
Supplier relationships29 (4)25 29 (3)26 
Total intangible assets$269 $(72)$197 $269 $(68)$201 
Intangible liabilities2:
Above-market supply contracts$(71)$25 $(46)$(71)$24 $(47)
1 Intangible assets are classified as Other non-current assets. Amortization related to mining permits is recognized in Cost of goods sold. Amortization of all other intangible assets is recognized in Selling, general and administrative expenses.
2 Intangible liabilities are classified as Other non-current liabilities. Amortization of all intangible liabilities is recognized in Cost of goods sold.
Amortization expense related to intangible assets was $4 million for both the three months ended March 31, 2024 and 2023. Estimated future amortization expense is $9 million for the remainder of 2024 and $13 million annually for the years 2025 through 2029.
Income from amortization related to the intangible liabilities was $1 million for both the three months ended March 31, 2024 and 2023. Estimated future income from amortization is $4 million for the remainder of 2024 and $5 million annually for the years 2025 through 2029.