SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Estimated Quantities of Oil and Natural Gas Reserves) (Details)	7 Months Ended		12 Months Ended
	Dec. 31, 2013 Boe		Dec. 31, 2014 Boe		Dec. 31, 2012 Boe
Proved reserves:
Balance at beginning of period (BOE)			464,000,000	[1]	0	[1]
Extension and discoveries (BOE)	24,000,000	[1]	16,000,000	[1]
Acquisitions of reserves in-place (BOE)	472,000,000	[1]	16,000,000	[1]
Revisions of previous estimates (BOE)	7,000,000	[1]	13,000,000	[1]
Sales of reserves in place (BOE)	(1,000,000)	[1]	(62,000,000)	[1]
Production (BOE)	(38,000,000)	[1]	(57,000,000)	[1]
Balance at end of period (BOE)	464,000,000	[1]	390,000,000	[1]	0	[1]
Proved developed reserves (BOE)	307,000,000	[1]	246,000,000	[1]
Proved undeveloped reserves (BOE)	157,000,000	[1]	144,000,000	[1]
Eagle Ford [Member]
Proved reserves:
Extension and discoveries (BOE)	16,000,000
Gulf of Mexico [Member]
Proved reserves:
Extension and discoveries (BOE)	5,000,000		8,000,000
Haynesville [Member]
Proved reserves:
Extension and discoveries (BOE)			5,000,000
Natural Gas Liquids [Member]
Proved reserves:
Balance at end of year	20,000,000		10,000,000
Proved developed reserves	14,000,000		7,000,000
Proved undeveloped reserves	6,000,000		3,000,000
Oil [Member]
Proved reserves:
Balance at beginning of year			370,000,000	[1],[2]	0	[1],[2]
Extensions and discoveries	20,000,000	[1],[2]	10,000,000	[1],[2]
Acquisitions of reserves in-place	368,000,000	[1],[2]	14,000,000	[1],[2]
Revisions of previous estimates	11,000,000	[1],[2]	(10,000,000)	[1],[2]
Sale of reserves in-place	0	[1],[2]	(53,000,000)	[1],[2]
Production	(29,000,000)	[1],[2]	(43,000,000)	[1],[2]
Balance at end of year	370,000,000	[1],[2]	288,000,000	[1],[2]	0	[1],[2]
Proved developed reserves	236,000,000	[1],[2]	184,000,000	[1],[2]
Proved undeveloped reserves	134,000,000	[1],[2]	104,000,000	[1],[2]
Natural Gas [Member]
Proved reserves:
Balance at beginning of year			562,000,000,000	[1]	0	[1]
Extensions and discoveries	20,000,000,000	[1]	35,000,000,000	[1]
Acquisitions of reserves in-place	626,000,000,000	[1]	9,000,000,000	[1]
Revisions of previous estimates	(26,000,000,000)	[1]	140,000,000,000	[1]
Sale of reserves in-place	(3,000,000,000)	[1]	(54,000,000,000)	[1]
Production	(55,000,000,000)	[1]	(82,000,000,000)	[1]
Balance at end of year	562,000,000,000	[1]	610,000,000,000	[1]	0	[1]
Proved developed reserves	423,000,000,000	[1]	369,000,000,000	[1]
Proved undeveloped reserves	139,000,000,000	[1]	241,000,000,000	[1]

[1] MMBbls = million barrels; Bcf = billion cubic feet; MMBOE = million BOE

[2] Includes 10 MMBbls of NGL proved reserves (7 MMBbls of developed and 3 MMBbls of undeveloped) at December 31, 2014, and 20 MMBbls of NGL proved reserves (14 MMBbls of developed and 6 MMBbls of undeveloped) at December 31, 2013.