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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Estimated Quantities of Oil and Natural Gas Reserves) (Details) | 7 Months Ended
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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.

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