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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Income (loss) from continuing operations before income taxes includes the following components:
|  | (In Millions)
|  | 2020 |  | 2019 |  | 2018
United States |  | $ | (201) |  |  | $ | 313 |  |  | $ | 565 |
Foreign |  | 8 |  |  | — |  |  | — |
|  | $ | (193) |  |  | $ | 313 |  |  | $ | 565 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of the income tax provision (benefit) on continuing operations consist of the following:
|  | (In Millions)
|  | 2020 |  | 2019 |  | 2018
Current provision (benefit): |  |  |  |  |  |
United States federal |  | $ | (2) |  |  | $ | (1) |  |  | $ | (1) |
United States state & local |  | — |  |  | — |  |  | — |
Foreign |  | (1) |  |  | — |  |  | 1 |
|  | (3) |  |  | (1) |  |  | — |
Deferred provision (benefit): |  |  |  |  |  |
United States federal |  | (95) |  |  | 19 |  |  | (475) |
United States state & local |  | (11) |  |  | — |  |  | — |
Foreign |  | (2) |  |  | — |  |  | — |
Total income tax provision (benefit) from continuing operations |  | $ | (111) |  |  | $ | 18 |  |  | $ | (475) |
The components of income taxes for other than continuing operations consisted of the following:
|  | (In Millions)
|  | 2020 |  | 2019 |  | 2018
Other comprehensive income: |  |  |  |  |  |
Postretirement benefit liability |  | $ | (52) |  |  | $ | 11 |  |  | $ | 4 |
Unrealized net loss on derivative financial instruments |  | (1) |  |  | — |  |  | 1 |
Total |  | $ | (53) |  |  | $ | 11 |  |  | $ | 5 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Reconciliation of our income tax attributable to continuing operations computed at the U.S. federal statutory rate is as follows:
|  | (In Millions)
|  | 2020 |  | 2019 |  | 2018
Tax at U.S. statutory rate |  | $ | (41) |  |  | 21 | % |  | $ | 66 |  |  | 21 | % |  | $ | 119 |  |  | 21 | %
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |
Percentage depletion in excess of cost depletion |  | (42) |  |  | 22 |  |  | (49) |  |  | (16) |  |  | (55) |  |  | (10) |
Non-taxable income related to noncontrolling interests |  | (9) |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | — |
Luxembourg legal entity reduction |  | — |  |  | — |  |  | 846 |  |  | 271 |  |  | 162 |  |  | 29 |
Valuation allowance release: |  |  |  |  |  |  |  |  |  |  |  |
Current year activity |  | — |  |  | — |  |  | — |  |  | — |  |  | (80) |  |  | (14) |
Release of U.S. valuation allowance |  | — |  |  | — |  |  | — |  |  | — |  |  | (461) |  |  | (81) |
Luxembourg legal entity reduction |  | — |  |  | — |  |  | (846) |  |  | (271) |  |  | (162) |  |  | (29) |
State taxes, net |  | (11) |  |  | 6 |  |  | — |  |  | — |  |  | — |  |  | — |
Other items, net |  | (8) |  |  | 4 |  |  | 1 |  |  | 1 |  |  | 2 |  |  | — |
Provision for income tax expense (benefit) and effective income tax rate including discrete items |  | $ | (111) |  |  | 57 | % |  | $ | 18 |  |  | 6 | % |  | $ | (475) |  |  | (84) | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of our deferred tax assets and liabilities are as follows:
| (In Millions)
| 2020 |  | 2019
Deferred tax assets: |  |  |
Operating loss and other carryforwards | $ | 1,236 |  |  | $ | 795 |
Pension and OPEB liabilities | 228 |  |  | 114 |
Property, plant and equipment and mineral rights | — |  |  | 1 |
State and local | 132 |  |  | 71 |
Other liabilities | 190 |  |  | 70 |
Total deferred tax assets before valuation allowance | 1,786 |  |  | 1,051 |
Deferred tax asset valuation allowance | (836) |  |  | (441) |
Net deferred tax assets | 950 |  |  | 610 |
Deferred tax liabilities: |  |  |
Investment in partnerships | (144) |  |  | (137) |
Property, plant and equipment and mineral rights | (246) |  |  | — |
Other assets | (68) |  |  | (14) |
Total deferred tax liabilities | (458) |  |  | (151) |
Net deferred tax assets | $ | 492 |  |  | $ | 459 |
Summary of Valuation Allowance [Table Text Block] | The changes in the valuation allowance are presented below:
| (In Millions)
| 2020 |  | 2019 |  | 2018
Balance at beginning of year | $ | 441 |  |  | $ | 1,287 |  |  | $ | 1,983 |
Change in valuation allowance: |  |  |  |  |
Included in income tax expense (benefit) | (3) |  |  | (846) |  |  | (691) |
Change in deferred assets in other comprehensive income | — |  |  | — |  |  | (5) |
Increase from acquisitions | 398 |  |  | — |  |  | — |
Balance at end of year | $ | 836 |  |  | $ | 441 |  |  | $ | 1,287 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
|  | (In Millions)
|  | 2020 |  | 2019 |  | 2018
Unrecognized tax benefits balance as of January 1 |  | $ | 29 |  |  | $ | 29 |  |  | $ | 33 |
Increase for tax positions in current year |  | 7 |  |  | — |  |  | 4 |
Decrease for tax positions of prior year |  | (4) |  |  | — |  |  | — |
Lapses in statutes of limitations |  | — |  |  | — |  |  | (8) |
Increases from acquisitions |  | 75 |  |  | — |  |  | — |
Unrecognized tax benefits balance as of December 31 |  | $ | 107 |  |  | $ | 29 |  |  | $ | 29 |

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