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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of components of the income tax provision (benefit) | The components of the income tax provision (benefit) for each of the periods presented below are as follows:
|  | Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
|  | ($ in millions)
Current |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |  |  | $ | (14 | )
State |  | (26 | ) |  | — |  |  | 5 |
Current Income Taxes |  | (26 | ) |  | — |  |  | (9 | )
Deferred |  |  |  |  |  |
Federal |  | (297 | ) |  | 3 |  |  | 13 |
State |  | (8 | ) |  | (13 | ) |  | (2 | )
Deferred Income Taxes |  | (305 | ) |  | (10 | ) |  | 11 |
Total |  | $ | (331 | ) |  | $ | (10 | ) |  | $ | 2 |
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,
|  | 2019 |  | 2018 |  | 2017
|  | ($ in millions)
Income tax expense (benefit) at the federal statutory rate (21%, 21%, 35%) |  | $ | (134 | ) |  | $ | 45 |  |  | $ | (175 | )
State income taxes (net of federal income tax benefit) |  | (21 | ) |  | 27 |  |  | 5 |
Partial release of valuation allowance due to the WildHorse Merger |  | (314 | ) |  | — |  |  | — |
Remeasurement of deferred tax assets and liabilities |  | — |  |  | — |  |  | 931 |
Change in valuation allowance excluding impact of WildHorse Merger |  | 114 |  |  | (97 | ) |  | (771 | )
Other |  | 24 |  |  | 15 |  |  | 12 |
Total |  | $ | (331 | ) |  | $ | (10 | ) |  | $ | 2 |
Schedule of deferred tax assets and liabilities | The tax-effected temporary differences, NOL carryforwards and disallowed business interest carryforwards that comprise our deferred income taxes are as follows:
|  | December 31,
|  | 2019 |  | 2018
|  | ($ in millions)
Deferred tax liabilities: |  |  |  |
Property, plant and equipment |  | $ | (546 | ) |  | $ | (976 | )
Volumetric production payments |  | (89 | ) |  | (86 | )
Carrying value of debt |  | — |  |  | (95 | )
Derivative instruments |  | (14 | ) |  | (56 | )
Other |  | (5 | ) |  | (7 | )
Deferred tax liabilities |  | (654 | ) |  | (1,220 | )
Deferred tax assets: |  |  |  |
Net operating loss carryforwards |  | 1,971 |  |  | 2,737 |
Carrying value of debt |  | 169 |  |  | — |
Disallowed business interest carryforward |  | 25 |  |  | 194 |
Asset retirement obligations |  | 50 |  |  | 40 |
Investments |  | 83 |  |  | 111 |
Accrued liabilities |  | 64 |  |  | 89 |
Other |  | 87 |  |  | 60 |
Deferred tax assets |  | 2,449 |  |  | 3,231 |
Valuation allowance |  | (1,805 | ) |  | (2,011 | )
Deferred tax assets after valuation allowance |  | 644 |  |  | 1,220 |
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:
|  | 2019 |  | 2018 |  | 2017
|  | ($ in millions)
Unrecognized tax benefits at beginning of period |  | $ | 79 |  |  | $ | 106 |  |  | $ | 202 |
Additions based on tax positions related to the current year |  | — |  |  | — |  |  | — |
Additions to tax positions of prior years |  | 27 |  |  | — |  |  | 4 |
Settlements |  | (32 | ) |  | — |  |  | (100 | )
Expiration of the applicable statute of limitations |  | — |  |  | (23 | ) |  | — |
Reductions to tax positions of prior years |  | — |  |  | (4 | ) |  | — |
Unrecognized tax benefits at end of period |  | $ | 74 |  |  | $ | 79 |  |  | $ | 106 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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