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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of components of the income tax provision (benefit) | The components of the income tax expense (benefit) for each of the periods presented below are as follows:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | ($ in millions)
Current |  |  |  |  |  |
Federal |  | $ | (3) |  |  | $ | — |  |  | $ | — |
State |  | (6) |  |  | (26) |  |  | — |
Current Income Taxes |  | (9) |  |  | (26) |  |  | — |
Deferred |  |  |  |  |  |
Federal |  | — |  |  | (297) |  |  | 3 |
State |  | (10) |  |  | (8) |  |  | (13) |
Deferred Income Taxes |  | (10) |  |  | (305) |  |  | (10) |
Total |  | $ | (19) |  |  | $ | (331) |  |  | $ | (10) |
Schedule of effective income tax expense (benefit) | The income tax expense (benefit) reported in our consolidated statement of operations is different from the federal income tax expense (benefit) computed using the federal statutory rate for the following reasons:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | ($ in millions)
Income tax expense (benefit) at the federal statutory rate of 21% |  | $ | (2,051) |  |  | $ | (134) |  |  | $ | 45 |
State income taxes (net of federal income tax benefit) |  | (41) |  |  | (21) |  |  | 27 |
Partial release of valuation allowance due to the WildHorse Merger |  | — |  |  | (314) |  |  | — |
Change in valuation allowance excluding impact of WildHorse Merger |  | 2,010 |  |  | 114 |  |  | (97) |
Reorganization items |  | 41 |  |  | — |  |  | — |
Equity-based compensation (non-officer) |  | 10 |  |  | 4 |  |  | 4 |
Officer compensation limited under Section 162(m) |  | 9 |  |  | 3 |  |  | 5 |
Other |  | 3 |  |  | 17 |  |  | 6 |
Total |  | $ | (19) |  |  | $ | (331) |  |  | $ | (10) |
Schedule of deferred tax assets and liabilities | The tax-effected temporary differences, net operating loss (NOL) carryforwards and disallowed business interest carryforwards that comprise our deferred income taxes are as follows:
|  | December 31,
|  | 2020 |  | 2019
|  | ($ in millions)
Deferred tax liabilities: |  |  |  |
Property, plant and equipment |  | $ | — |  |  | $ | (546) |
Volumetric production payments |  | — |  |  | (89) |
Derivative instruments |  | — |  |  | (14) |
Other |  | (3) |  |  | (5) |
Deferred tax liabilities |  | (3) |  |  | (654) |
Deferred tax assets: |  |  |  |
Property, plant and equipment |  | 907 |  |  | — |
Net operating loss carryforwards |  | 2,066 |  |  | 1,971 |
Carrying value of debt |  | 48 |  |  | 169 |
Disallowed business interest carryforward |  | 293 |  |  | 25 |
Asset retirement obligations |  | 34 |  |  | 50 |
Investments |  | 71 |  |  | 83 |
Accrued liabilities |  | 288 |  |  | 64 |
Derivative instruments |  | 53 |  |  | — |
Other |  | 51 |  |  | 87 |
Deferred tax assets |  | 3,811 |  |  | 2,449 |
Valuation allowance |  | (3,808) |  |  | (1,805) |
Deferred tax assets after valuation allowance |  | 3 |  |  | 644 |
Net deferred tax liability |  | $ | — |  |  | $ | (10) |
Reconciliation of unrecognized tax benefits | A reconciliation of the beginning and ending balances of unrecognized tax benefits is as follows:
|  | 2020 |  | 2019 |  | 2018
|  | ($ in millions)
Unrecognized tax benefits at beginning of period |  | $ | 74 |  |  | $ | 79 |  |  | $ | 106 |
Additions based on tax positions related to the current year |  | — |  |  | — |  |  | — |
Additions to tax positions of prior years |  | — |  |  | 27 |  |  | — |
Settlements |  | — |  |  | (32) |  |  | — |
Expiration of the applicable statute of limitations |  | — |  |  | — |  |  | (23) |
Reductions to tax positions of prior years |  | — |  |  | — |  |  | (4) |
Unrecognized tax benefits at end of period |  | $ | 74 |  |  | $ | 74 |  |  | $ | 79 |

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