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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Changes in the Standardized Measure) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |
Balance at beginning of year | $ 1,392
Sales, net of production expenses | (831)
Net changes in sales and transfer prices, net of production expenses | (341)
Extensions, discoveries and improved recoveries | 0
Changes in estimated future development costs, including timing and other | 146
Previously estimated development costs incurred during the year | 295
Sales of reserves in-place | (1,049)
Revisions of quantity estimates | 12
Accretion of discount | 139
Net change in income taxes | 0
Total changes | (1,629)
Balance at end of year | $ (237)

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