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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Changes in the Standardized Measure) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 1,392 | $ 6,421 | $ 9,417
Sales, net of production expenses | (831) | (928) | (3,062)
Net changes in sales and transfer prices, net of production expenses | (341) | (7,766) | (2,875)
Extensions, discoveries and improved recoveries | 0 | 45 | 194
Changes in estimated future development costs, including timing and other | 146 | 1,287 | (498)
Previously estimated development costs incurred during the year | 295 | 985 | 982
Sales of reserves in-place | (1,049) | 0 | (1,323)
Other purchases of reserves in-place | 0 | 0 | 487
Revisions of quantity estimates | 12 | (1,170) | 399
Accretion of discount | 139 | 797 | 1,195
Net change in income taxes | 0 | 1,721 | 1,505
Total changes | (1,629) | (5,029) | (2,996)
Balance at end of year | $ (237) | $ 1,392 | $ 6,421

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + Details
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