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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Costs Incurred) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property acquisition costs: |  |  |
Proved properties | $ 0 | $ 0 | $ 463
Unproved properties | 7 | 61 | 1,460
Exploration costs | 22 | 1,250 | 1,482
Development costs | 749 | 1,442 | 1,270
Total | 778 | 2,753 | 4,675
Asset Retirement Obligation, Period Increase (Decrease) | 37 | (80) | (27)
United States oil and gas operations |  |  |
Property acquisition costs: |  |  |
General and Administrative Costs Capitalized | 78 | 124 | 143
Capitalized interest | $ 7 | $ 58 | $ 88

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