Oil and Natural Gas Property Transactions (Tables)

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

VPP Transactions [Table Text Block]

As of March 31, 2015, 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
8	September 2010	Barnett Shale	1,150		—	390	—	390
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
			$	5,481	5.2	1,105	14.0	1,220

VPP Volumes Produced During Period [Table Text Block]

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, 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	—	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
	Three Months Ended March 31, 2014
VPP #	Oil	Natural Gas	NGL	Total
	(mbbl)	(bcf)	(mbbl)	(bcfe)
10	109.0	2.8	345.2	5.5
9	49.0	4.0	106.5	4.9
8	—	15.7	—	15.7
6(a)	6.0	1.1	—	1.2
5(a)	6.3	1.7	—	1.8
4	12.4	2.3	—	2.4
3	—	1.9	—	1.9
2	—	2.4	—	2.4
1	—	3.6	—	3.6
	182.7	35.5	451.7	39.4

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(a) In 2014, we divested the properties associated with VPP #5 and VPP #6.

The v

VPP Volumes Remaining to be Delivered [Table Text Block]

The volumes remaining to be delivered on behalf of our VPP buyers as of March 31, 2015 were as follows:

		Volume Remaining as of March 31, 2015
VPP #	Term Remaining	Oil	Natural Gas	NGL	Total
	(in months)	(mmbbl)	(bcf)	(mmbbl)	(bcfe)
10	83	1.2	35.8	4.4	69.6
9	71	0.8	69.5	1.8	85.3
8	5	—	22.5	—	22.5
4	21	0.1	13.3	—	13.7
3	52	—	22.2	—	22.2
2	49	—	12.8	—	12.8
1	93	—	88.1	—	88.1
		2.1	264.2	6.2	314.2