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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Estimated Quantities of Oil and Natural Gas Reserves) (Details) bbl in Millions, ft³ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 Boe $ / bbl $ / Mcf bbl ft³ | Dec. 31, 2015 Boe $ / bbl $ / Mcf bbl ft³ | Dec. 31, 2014 bbl ft³
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Balance at beginning of year (Energy) | Boe | 252,000,000 | 390,000,000 |
Extensions and discoveries (Energy) | Boe | 0 | 17,000,000 |
Acquisitions of reserves in-place (Energy) | Boe | 0 | 0 |
Revisions of previous estimates (Energy) | Boe | 1,000,000 | (102,000,000) |
Sales of reserves in-place (Energy) | Boe | 187,000,000 | 0 |
Production (Energy) | Boe | 48,000,000 | 53,000,000 |
Balance at end of year (Energy) | Boe | 18,000,000 | 252,000,000 |
Proved developed reserves (Energy) | Boe | 18,000,000 | 169,000,000 |
Proved undeveloped reserves (Energy) | Boe | 0 | 83,000,000 |
Gulf of Mexico [Member] |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Extensions and discoveries (Energy) | Boe |  | 14,000,000 |
Haynesville |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Extensions and discoveries (Energy) | Boe |  | 3,000,000 |
Deepwater Gulf of Mexico, Onshore California and Haynesville Oil And Gas Properties [Member] |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Sales of reserves in-place (Energy) | Boe | 187 |  |
Natural Gas Liquids [Member] |  |  |
Proved reserves: |  |  |
Balance at beginning of year | 1 | 9 |
Balance at end of year | 1 | 9 |
Proved developed reserves |  | 6 |
Proved undeveloped reserves |  | 3 |
Oil [Member] |  |  |
Proved reserves: |  |  |
Balance at beginning of year | 4 | 207 | 288
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 0 | 11 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 0 | 0 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | 1 | (54) |
Sale of reserves in-place | (168) | 0 |
Production | (36) | (38) |
Balance at end of year | 4 | 207 | 288
Proved developed reserves | 4 | 129 |
Proved undeveloped reserves | 0 | 78 |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Realized Sales Prices Used in Reserve Reports | $ / bbl | 34.26 | 47.80 |
Natural Gas [Member] |  |  |
Proved reserves: |  |  |
Balance at beginning of year | ft³ | 87 | 274 | 610
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | ft³ | 0 | 43 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | ft³ | 0 | 0 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | ft³ | 0 | (287) |
Sale of reserves in-place | ft³ | (118) | (2) |
Production | ft³ | (69) | (90) |
Balance at end of year | ft³ | 87 | 274 | 610
Proved developed reserves | ft³ | 87 | 245 |
Proved undeveloped reserves | ft³ | 0 | 29 |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Realized Sales Prices Used in Reserve Reports | $ / Mcf | 2.40 | 2.55 |

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