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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, $ in Millions, ft³ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Boe $ / bbl $ / Mcf bbl ft³ | Dec. 31, 2015 Boe $ / bbl $ / Mcf bbl ft³ | Dec. 31, 2014 Boe bbl ft³ | Dec. 31, 2013 bbl ft³
Proved reserves: |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ | $ 0 |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |
Balance at beginning of year (Energy) | Boe | 252,000,000 | 390,000,000 | 464,000,000 |  |
Extensions and discoveries (Energy) | Boe | 0 | 17,000,000 | 16,000,000 |  |
Acquisitions of reserves in-place (Energy) | Boe | 0 | 0 | 16,000,000 | [1] |
Revisions of previous estimates (Energy) | Boe | 1,000,000 | (102,000,000) | 13,000,000 |  |
Sales of reserves in-place (Energy) | Boe | 187,000,000 | 0 | 62,000,000 |  |
Production (Energy) | Boe | 48,000,000 | 53,000,000 | 57,000,000 |  |
Balance at end of year (Energy) | Boe | 18,000,000 | 252,000,000 | 390,000,000 |  |
Proved developed reserves (Energy) | Boe | 18,000,000 | 169,000,000 | 246,000,000 |  |
Proved undeveloped reserves (Energy) | Boe | 0 | 83,000,000 | 144,000,000 |  |
Gulf of Mexico [Member] |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |
Extensions and discoveries (Energy) | Boe |  | 14,000,000 | 8,000,000 |  |
Haynesville |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |
Extensions and discoveries (Energy) | Boe |  | 3,000,000 | 5 |  |
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 |  |  |  |
Eagle Ford shale assets |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |
Sales of reserves in-place (Energy) | Boe |  |  | 62,000,000 |  |
Natural Gas Liquids [Member] |  |  |  |  |
Proved reserves: |  |  |  |  |
Balance at beginning of year | bbl | 1 | 9 | 10 |  |
Balance at end of year | bbl | 1 | 9 | 10 |  |
Proved developed reserves | bbl |  | 6 | 7 |  |
Proved undeveloped reserves | bbl |  | 3 | 3 |  |
Oil [Member] |  |  |  |  |
Proved reserves: |  |  |  |  |
Balance at beginning of year | bbl | 4 | 207 | 288 |  | 370
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | bbl | 0 | 11 | 10 |  |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | bbl | 0 | 0 | 14 |  |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | bbl | 1 | (54) | (10) |  |
Sale of reserves in-place | bbl | (168) | 0 | (53) |  |
Production | bbl | (36) | (38) | (43) |  |
Balance at end of year | bbl | 4 | 207 | 288 |  | 370
Proved developed reserves | bbl | 4 | 129 | 184 |  |
Proved undeveloped reserves | bbl | 0 | 78 | 104 |  |
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 |  | 562
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | ft³ | 0 | 43 | 35 |  |
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | ft³ | 0 | 0 | 9 |  |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | ft³ | 0 | (287) | 140 |  |
Sale of reserves in-place | ft³ | (118) | (2) | (54) |  |
Production | ft³ | (69) | (90) | (82) |  |
Balance at end of year | ft³ | 87 | 274 | 610 |  | 562
Proved developed reserves | ft³ | 87 | 245 | 369 |  |
Proved undeveloped reserves | ft³ | 0 | 29 | 241 |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |
Realized Sales Prices Used in Reserve Reports | $ / Mcf | 2.40 | 2.55 |  |  |
[1] | MMBbls = million barrels; Bcf = billion cubic feet; MMBOE = million BOE

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