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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets And Liabilities | NOTE 7 - GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES Goodwill The following is a summary of Goodwill by segment:
| (In Millions)
| March 31, 2021 |  | December 31, 2020
Steelmaking | $ | 820 |  |  | $ | 1,232 |
Other Businesses | 174 |  |  | 174 |
Total goodwill | $ | 994 |  |  | $ | 1,406 |
The decrease of $412 million in the balance of Goodwill in our Steelmaking segment as of March 31, 2021, compared to December 31, 2020, is due to the change in estimated identified goodwill as a result of measurement period adjustments to the preliminary purchase price allocation for the acquisition of ArcelorMittal USA. Refer to NOTE 3 - ACQUISITIONS for further details. Intangible Assets and Liabilities The following is a summary of our intangible assets and liabilities:
|  | (In Millions)
|  | March 31, 2021 |  | December 31, 2020
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Intangible assets 1: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 77 |  |  | $ | (5) |  |  | $ | 72 |  |  | $ | 77 |  |  | $ | (3) |  |  | $ | 74 |
Developed technology |  | 60 |  |  | (4) |  |  | 56 |  |  | 60 |  |  | (3) |  |  | 57 |
Trade names and trademarks |  | 11 |  |  | (1) |  |  | 10 |  |  | 11 |  |  | (1) |  |  | 10 |
Mining permits |  | 72 |  |  | (25) |  |  | 47 |  |  | 72 |  |  | (25) |  |  | 47 |
Total intangible assets |  | $ | 220 |  |  | $ | (35) |  |  | $ | 185 |  |  | $ | 220 |  |  | $ | (32) |  |  | $ | 188 |
Intangible liabilities 2: |  |  |  |  |  |  |  |  |  |  |  |
Above-market supply contracts |  | $ | (71) |  |  | $ | 8 |  |  | $ | (63) |  |  | $ | (71) |  |  | $ | 7 |  |  | $ | (64) |
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 $3 million and $1 million for the three months ended March 31, 2021 and 2020, respectively. Estimated future amortization expense is $7 million for the remainder of 2021 and $10 million annually for the years 2022 through 2026. Income from amortization related to the intangible liabilities was $1 million and $2 million for the three months ended March 31, 2021 and 2020, respectively. Estimated future income from amortization is $6 million for the remainder of 2021 and $5 million annually for the years 2022 through 2026.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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