SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Estimated Quantities of Oil and Natural Gas Reserves) (Details)	7 Months Ended
	Dec. 31, 2013 Boe
Proved reserves:
Acquisitions of PXP and MMR (BOE)	472,000,000	[1]
Extension and discoveries (BOE)	24,000,000	[1]
Revisions of previous estimates (BOE)	7,000,000	[1]
Sales of reserves in place (BOE)	(1,000,000)	[1]
Production (BOE)	(38,000,000)	[1]
Balance at December 31, 2013 (BOE)	464,000,000	[1]
Proved developed reserves at December 31, 2013 (BOE)	307,000,000	[1]
Proved undeveloped reserves at December 31, 2013 (BOE)	157,000,000	[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
Onshore California and Deepwater Gulf of Mexico [Member]
Proved reserves:
Revisions of previous estimates (BOE)	29,000,000
Haynesville and Deepwater Gulf of Mexico [Member]
Proved reserves:
Revisions of previous estimates (BOE)	22,000,000
Natural Gas Liquids [Member]
Proved reserves:
Balance at December 31, 2013	20,000,000
Proved developed reserves at December 31, 2013	14,000,000
Proved undeveloped reserves at December 31, 2013	6,000,000
Oil [Member]
Proved reserves:
Acquisitions of PXP and MMR	368,000,000	[1],[2]
Extensions and discoveries	20,000,000	[1],[2]
Revisions of previous estimates	11,000,000	[1],[2]
Sale of reserves in-place	0	[1],[2]
Production	(29,000,000)	[1],[2]
Balance at December 31, 2013	370,000,000	[1],[2]
Proved developed reserves at December 31, 2013	236,000,000	[1],[2]
Proved undeveloped reserves at December 31, 2013	134,000,000	[1],[2]
Natural Gas [Member]
Proved reserves:
Acquisitions of PXP and MMR	626,000,000,000	[1]
Extensions and discoveries	20,000,000,000	[1]
Revisions of previous estimates	(26,000,000,000)	[1]
Sale of reserves in-place	(3,000,000,000)	[1]
Production	(55,000,000,000)	[1]
Balance at December 31, 2013	562,000,000,000	[1]
Proved developed reserves at December 31, 2013	423,000,000,000	[1]
Proved undeveloped reserves at December 31, 2013	139,000,000,000	[1]

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

[2] Included 20 MMBbls of NGL proved reserves, consisting of 14 MMBbls of proved developed and 6 MMBbls of proved undeveloped at December 31, 2013.