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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, Boe in Millions, ft³ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 Boe $ / bbl $ / Mcf ft³ bbl | Dec. 31, 2015 ft³ bbl
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |
Balance at beginning of year (Energy) | Boe | 252 |
Extensions and discoveries (Energy) | Boe | 0 |
Acquisitions of reserves in-place (Energy) | Boe | 0 |
Revisions of previous estimates (Energy) | Boe | 1 |
Sales of reserves in-place (Energy) | Boe | 187 |
Production (Energy) | Boe | 48 |
Balance at end of year (Energy) | Boe | 18 |
Proved developed reserves (Energy) | Boe | 18 |
Proved undeveloped reserves (Energy) | Boe | 0 |
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 |
Balance at end of year | 1 |
Oil [Member] |  |
Proved reserves: |  |
Balance at beginning of year | 4 | 207
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | 0 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | 0 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | 1 |
Sale of reserves in-place | (168) |
Production | (36) |
Balance at end of year | 4 | 207
Proved developed reserves | 4 |
Proved undeveloped reserves | 0 |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |
Realized Sales Prices Used in Reserve Reports | $ / bbl | 34.26 |
Natural Gas [Member] |  |
Proved reserves: |  |
Balance at beginning of year | ft³ | 87 | 274
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | ft³ | 0 |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | ft³ | 0 |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | ft³ | 0 |
Sale of reserves in-place | ft³ | (118) |
Production | ft³ | (69) |
Balance at end of year | ft³ | 87 | 274
Proved developed reserves | ft³ | 87 |
Proved undeveloped reserves | ft³ | 0 |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |
Realized Sales Prices Used in Reserve Reports | $ / Mcf | 2.40 |

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