A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

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- Definition

Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

+ References

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- Definition

The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10.(a)(2))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

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- Definition

Production of proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

Purchase of minerals in place.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

+ References

No definition available.

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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61884-109447

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61797-109447

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- Definition

Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

+ References

No definition available.

+ Details

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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

+ References

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- Definition

Represents the amount of capital costs incurred to convert proved undeveloped reserves to proved developed reserves.

+ References

No definition available.

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The maximum period proved reserves are scheduled to be drilled after the reporting date.

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No definition available.

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Represents the year-end upward (downward) revision of proved reserves.

+ References

No definition available.

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Represents the year-end upward (downward) revision of proved reserves due to discoveries and extensions.

+ References

No definition available.

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Represents the year-end upward (downward) revision of proved reserves due to performance.

+ References

No definition available.

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Represents the year-end upward (downward) revision of proved reserves due to pricing.

+ References

No definition available.

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Volume measure of increase (decrease) of quantity of proved undeveloped reserve of oil and gas, stated in a unit of volume.

+ References

No definition available.

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Represents the quantity of undeveloped reserves transferred to developed reserves.

+ References

No definition available.

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OIL AND GAS RESERVE DATA (UNAUDITED) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) MMBoe MBoe Bcf MMBbls MMcf	Dec. 31, 2014 USD ($) MMBoe MBoe Bcf MMBbls MMcf	Dec. 31, 2015 MBoe MMBbls MMcf	Dec. 31, 2014 MBoe MMBbls MMcf	Dec. 31, 2013 MBoe Bcf MMBbls MMcf
Proved reserves
Maximum period proved reserves to be drilled	5 years	5 years
Proved reserves (Equivalent Units)
Beginning of year \| MBoe	71,348	33,745
Purchases of oil and gas reserves in place \| MBoe		34,140
Discoveries and extensions \| MBoe	845	4,403
Revisions of previous estimates	(26,314)	2,859
Production	(5,652)	(3,799)
End of year \| MBoe	40,227	71,348
Proved developed reserves (Energy) \| MBoe			32,339	42,439
Proved undeveloped reserves (Energy) \| MBoe			7,888	28,909
Proved developed and undeveloped reserves (Energy) \| MBoe	71,348	33,745	40,227	71,348	33,745
Undeveloped reserves transferred to developed reserves \| MMBoe	0.8	3.9
Capital costs of conversion of proved undeveloped reserves to proved developed reserves \| $	$ 12.9	$ 92.9
Oil.
Proved reserves
Beginning of year	16,794	16,074
Discoveries and extensions	69	481
Revisions of previous estimates	(2,944)	1,357
Production	(980)	(1,118)
End of year	12,939	16,794
Proved reserves (Equivalent Units)
Proved developed reserves			6,824	8,561
Proved undeveloped reserves			6,115	8,233
Proved developed and undeveloped reserves	16,794	16,074	12,939	16,794	16,074
Year-end net upward (downward) revision	(2.9)	1.4
Year-end upward (downward) revision due to pricing	(2.2)	(0.2)
Year-end upward (downward) revision due to performance	(0.7)	1.6
Year-end upward (downward) revision due to discoveries and extensions	0.07	0.5
Natural Gas
Proved reserves
Beginning of year \| MMcf	327,328	106,028
Purchase of reserves in place \| MMcf		204,839
Discoveries and extensions \| MMcf	4,654	23,533
Revisions of previous estimates \| MMcf	(140,218)	9,013
Production \| MMcf	(28,033)	(16,085)
End of year \| MMcf	163,731	327,328
Proved reserves (Equivalent Units)
Proved developed reserves \| MMcf			153,093	203,272
Proved undeveloped reserves			10,638	124,056	28
Proved developed and undeveloped reserves \| MMcf	327,328	106,028	163,731	327,328	106,028
Year-end net upward (downward) revision \| Bcf	(140)	9
Year-end upward (downward) revision due to pricing \| Bcf	(124)	5.7
Year-end upward (downward) revision due to performance \| Bcf	(16)	3.3
Natural Gas \| Citrus Acquisition Of Marcellus Assets
Proved reserves (Equivalent Units)
Proved undeveloped reserve added for the period \| Bcf		93
Natural Gas \| Marcellus Shale in Pennsylvania
Proved reserves
Discoveries and extensions \| Bcf	4.7	18
Natural Gas \| Wyoming
Proved reserves
Discoveries and extensions \| Bcf		6