Basis of Presentation and Summary of Significant Accounting Policies (Tables)

12 Months Ended

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