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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] | The following represents the assets and liabilities measured at fair value as of December 31, 2019:
| (In Millions)
| December 31, 2019
| Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
Assets: |  |  |  |  |  |  |
Cash equivalents - Commercial paper | $ | — |  |  | $ | 188 |  |  | $ | — |  |  | $ | 188 |
Other current assets: |  |  |  |  |  |  |
Customer supply agreement | — |  |  | — |  |  | 45 |  |  | 45 |
Total | $ | — |  |  | $ | 188 |  |  | $ | 45 |  |  | $ | 233 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following tables represent a reconciliation of the changes in fair value of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
| (In Millions)
| Level 3 Assets
| 2020 |  | 2019
Beginning balance - January 1 | $ | 45 |  |  | $ | 89 |
Total gains included in earnings | 122 |  |  | 79 |
Settlements | (27) |  |  | (123) |
Settlement of pre-existing relationship | (140) |  |  | — |
Ending balance - December 31 | $ | — |  |  | $ | 45 |
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date | $ | — |  |  | $ | 45 |
Schedule Of Carrying Value And Fair Value Of Financial Instruments | A summary of the carrying value and fair value of other financial instruments were as follows:
|  |  | (In Millions)
|  |  | December 31, 2020 |  | December 31, 2019
| Classification |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Senior notes | Level 1 |  | $ | 3,802 |  |  | $ | 4,446 |  |  | $ | 2,114 |  |  | $ | 2,237 |
IRBs due 2024 to 2028 | Level 1 |  | 94 |  |  | 91 |  |  | — |  |  | — |
EDC Revolving Facility - outstanding balance | Level 2 |  | 18 |  |  | 18 |  |  | — |  |  | — |
ABL Facility - outstanding balance | Level 2 |  | 1,510 |  |  | 1,510 |  |  | — |  |  | — |
Total |  |  | $ | 5,424 |  |  | $ | 6,065 |  |  | $ | 2,114 |  |  | $ | 2,237 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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