Oil and Natural Gas Property Transactions (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

VPP Transactions

As of December 31, 2017, we had the following VPP outstanding:

					Volume Sold
VPP #	Date of VPP	Location	Proceeds		Oil	Natural Gas	NGL	Total
			($ in millions)		(mmbbl)	(bcf)	(mmbbl)	(bcfe)
9	May 2011	Mid-Continent	$	853	1.7	138	4.8	177

VPP Volumes Produced During Period

VPP Volumes Remaining to Be Delivered

The volumes remaining to be delivered on behalf of our VPP buyers as of December 31, 2017 were as follows:

		Volume Remaining as of December 31, 2017
VPP #	Term Remaining	Oil	Natural Gas	NGL	Total
	(in months)	(mmbbl)	(bcf)	(mmbbl)	(bcfe)
9	38	0.4	34.1	0.9	41.7