Oil and Natural Gas Property Transactions (Tables)

3 Months Ended

Mar. 31, 2016

Property, Plant and Equipment [Abstract]

VPP Transactions

As of March 31, 2016, our outstanding VPPs consisted of the following:

					Volume Sold
VPP #	Date of VPP	Location	Proceeds		Oil	Natural Gas	NGL	Total
			($ in millions)		(mmbbl)	(bcf)	(mmbbl)	(bcfe)
10	March 2012	Anadarko Basin Granite Wash	$	744	3.0	87	9.2	160
9	May 2011	Mid-Continent	853		1.7	138	4.8	177
4	December 2008	Anadarko and Arkoma Basins	412		0.5	95	—	98
3	August 2008	Anadarko Basin	600		—	93	—	93
2	May 2008	Texas, Oklahoma and Kansas	622		—	94	—	94
1	December 2007	Kentucky and West Virginia	1,100		—	208	—	208
			$	4,331	5.2	715	14.0	830

VPP Volumes Produced During Period

The volumes produced on behalf of our VPP buyers during the Current Quarter and the Prior Quarter were as follows:

	Three Months Ended March 31, 2016
VPP #	Oil	Natural Gas	NGL	Total
	(mbbl)	(bcf)	(mbbl)	(bcfe)
10	66.0	1.8	222.7	3.5
9	39.4	3.4	89.3	4.1
4	10.1	1.9	—	2.0
3	—	1.5	—	1.5
2	—	0.9	—	0.9
1	—	3.3	—	3.3
	115.5	12.8	312.0	15.3
	Three Months Ended March 31, 2015
VPP #	Oil	Natural Gas	NGL	Total
	(mbbl)	(bcf)	(mbbl)	(bcfe)
10	83.0	2.2	276.3	4.4
9	43.6	3.7	97.0	4.5
8(a)	—	14.0	—	14.0
4	11.0	2.1	—	2.1
3	—	1.7	—	1.7
2	—	1.1	—	1.1
1	—	3.5	—	3.5
	137.6	28.3	373.3	31.3

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(a) VPP #8 expired in August 2015.

VPP Volumes Remaining to Be Delivered

The volumes remaining to be delivered on behalf of our VPP buyers as of March 31, 2016 were as follows:

		Volume Remaining as of March 31, 2016
VPP #	Term Remaining	Oil	Natural Gas	NGL	Total
	(in months)	(mmbbl)	(bcf)	(mmbbl)	(bcfe)
10	71	0.9	27.7	3.4	53.9
9	59	0.6	55.7	1.5	68.3
4	9	—	5.4	—	5.6
3	40	—	16.0	—	16.0
2	37	—	8.9	—	8.9
1	81	—	75.0	—	75.0
		1.5	188.7	4.9	227.7