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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following is a summary of goodwill by segment:
| (In Millions)
| December 31,
| 2020 |  | 2019
Steelmaking | $ | 1,232 |  |  | $ | 2 |
Other Businesses | 174 |  |  | — |
Total goodwill | $ | 1,406 |  |  | $ | 2 |
Schedule of Acquired Intangible Assets and Liabilities by Major Class | The following is a summary of our intangible assets and liabilities:
|  |  | (In Millions)
| Classification 1 |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
As of December 31, 2020 |  |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |  |
Customer relationships | Other non-current assets |  | $ | 77 |  |  | $ | (3) |  |  | $ | 74 |
Technology | Other non-current assets |  | 60 |  |  | (3) |  |  | 57 |
Trade names and trademarks | Other non-current assets |  | 11 |  |  | (1) |  |  | 10 |
Mining permits | Other non-current assets |  | 72 |  |  | (25) |  |  | 47 |
Total intangible assets |  |  | $ | 220 |  |  | $ | (32) |  |  | $ | 188 |
Intangible liabilities: |  |  |  |  |  |  |
Above-market supply contracts | Other non-current liabilities |  | $ | (71) |  |  | $ | 7 |  |  | $ | (64) |
As of December 31, 2019 |  |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |  |
Mining permits | Other non-current assets |  | $ | 72 |  |  | $ | (24) |  |  | $ | 48 |
1 Amortization of intangible liabilities related to above-market supply contracts and intangible assets 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.

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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