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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Text Block [Abstract] |
Accounts Receivable, Allowance for Credit Loss | The following is a roll-forward of our allowance for credit losses associated with Accounts receivable, net:
| (In Millions)
| 2020 |  | 2019
Allowance for credit losses as of January 1 | $ | — |  |  | $ | — |
Increase in allowance | (5) |  |  | — |
Allowance for credit losses as of December 31 | $ | (5) |  |  | $ | — |
Schedule Of Inventories | The following table presents the detail of our Inventories in the Statements of Consolidated Financial Position:
| (In Millions)
| Year Ended December 31,
| 2020 |  | 2019
Product inventories |  |  |
Finished and semi-finished goods | $ | 2,125 |  |  | $ | 114 |
Work-in-process | — |  |  | 69 |
Raw materials | 1,431 |  |  | 9 |
Total product inventories | 3,556 |  |  | 192 |
Manufacturing supplies and critical spares | 272 |  |  | 125 |
Inventories | $ | 3,828 |  |  | $ | 317 |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | A reconciliation of capital additions to cash paid for capital expenditures is as follows:
| (In Millions)
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Capital additions | $ | 483 |  |  | $ | 690 |  |  | $ | 395 |
Less: |  |  |  |  |
Non-cash accruals | (86) |  |  | 15 |  |  | 94 |
Right-of-use assets - finance leases | 44 |  |  | 29 |  |  | 8 |
Grants | — |  |  | (10) |  |  | (3) |
Cash paid for capital expenditures including deposits | $ | 525 |  |  | $ | 656 |  |  | $ | 296 |
Cash payments (receipts) for interest and income taxes are as follows:
| (In Millions)
2020 |  | 2019 |  | 2018
Taxes paid on income | $ | 5 |  |  | $ | — |  |  | $ | 3 |
Income tax refunds | (120) |  |  | (118) |  |  | (11) |
Interest paid on debt obligations net of capitalized interest 1 | 170 |  |  | 98 |  |  | 106 |
1 Capitalized interest was $53 million, $25 million and $7 million for the years ended December 31, 2020, 2019 and 2018, respectively.
Schedule of Noncash or Part Noncash Acquisitions | Non-Cash Investing and Financing Activities
| (In Millions)
2020 |  | 2019 |  | 2018
Fair value of common shares issued as part of consideration in connection with AM USA Transaction | $ | 990 |  |  | $ | — |  |  | $ | — |
Fair value of Series B Participating Redeemable Preferred Stock issued as part of consideration in connection with AM USA Transaction | 738 |  |  | — |  |  | — |
Fair value of settlement of a pre-existing relationship as part of consideration in connection with AM USA Transaction | 237 |  |  | — |  |  | — |
Fair value of common shares issued as consideration in connection with AK Steel Merger | 618 |  |  | — |  |  | — |
Fair value of equity awards assumed in connection with AK Steel Merger | 4 |  |  | — |  |  | — |

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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