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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Summary of Reclassifications | The following table reflects the reclassifications made:
|  | Years Ended December 31,
|  | 2018 |  | 2017
|  | $ in millions
Oil, natural gas and NGL production, previously reported |  | $ | 539 |  |  | $ | 562 |
Reclassification of ad valorem taxes |  | (65 | ) |  | (45 | )
Oil, natural gas and NGL production, as currently reported |  | $ | 474 |  |  | $ | 517 |
The corresponding amounts have been reflected in severance and ad valorem taxes for 2018 and 2017 as shown below:
|  | Years Ended December 31,
|  | 2018 |  | 2017
|  | $ in millions
Production taxes, previously reported |  | $ | 124 |  |  | $ | 89 |
Reclassification of ad valorem taxes |  | 65 |  |  | 45 |
Severance and ad valorem taxes, as currently reported |  | $ | 189 |  |  | $ | 134 |

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