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Segment Information - Table (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total Revenues | $ 1,953 | $ 3,218 |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | (921) | (5,092) |
TOTAL ASSETS | 15,357 |  | $ 17,314
Oil And Gas Exploration And Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 993 | 1,543 |
Marketing, Gathering And Compression [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 960 | 1,675 |
Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0 | 0 |
Reportable Subsegments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 1,953 | 3,218 |
Intersubsegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0 | 0 |
Operating Segments [Member] | Reportable Subsegments [Member] | Oil And Gas Exploration And Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 993 | 1,520 |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | (895) | (5,349) |
TOTAL ASSETS | 12,624 |  | 14,610
Operating Segments [Member] | Reportable Subsegments [Member] | Oil And Gas Exploration And Production [Member] | Scenario, Previously Reported [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS |  |  | 11,776
Operating Segments [Member] | Reportable Subsegments [Member] | Marketing, Gathering And Compression [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 1,743 | 2,908 |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | 40 | 4 |
TOTAL ASSETS | 1,425 |  | 1,524
Operating Segments [Member] | Reportable Subsegments [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0 | 0 |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | (9) | (14) |
TOTAL ASSETS | 1,468 |  | 1,491
Operating Segments [Member] | Reportable Subsegments [Member] | Other Segments [Member] | Scenario, Previously Reported [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS |  |  | 4,325
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | (783) | 0 |
Intersegment Eliminations [Member] | Reportable Subsegments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0 | (1,210) |
Intersegment Eliminations [Member] | Intersubsegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 783 | 1,210 |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | (57) | 267 |
TOTAL ASSETS | (160) |  | $ (311)
Intersegment Eliminations [Member] | Intersubsegment Eliminations [Member] | Oil And Gas Exploration And Production [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0 | 23 |
Intersegment Eliminations [Member] | Intersubsegment Eliminations [Member] | Marketing, Gathering And Compression [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | (783) | (1,233) |
Intersegment Eliminations [Member] | Intersubsegment Eliminations [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | $ 0 | $ 0 |

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