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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Changes in the Standardized Measure) (Details) - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2013
 [1]
Dec. 31, 2015
Dec. 31, 2014
Supplemental Oil and Gas Information [Abstract]      
Balance at beginning of year   $ 6,421 $ 9,417 [1]
Reserves acquired in the acquisitions of PXP and MMR $ 14,467 0 0
Sales, net of production expenses (2,296) (928) (3,062)
Net changes in sales and transfer prices, net of production expenses (459) (7,766) (2,875)
Extensions, discoveries and improved recoveries 752 45 194
Changes in estimated future development costs (1,190) 1,287 (498)
Previously estimated development costs incurred during the year 578 985 982
Sales of reserves in-place (12) 0 (1,323)
Other purchases of reserves in-place 0 0 487
Revisions of quantity estimates 102 (1,170) 399
Accretion of discount 701 797 1,195
Net change in income taxes (3,226) 1,721 1,505
Total changes 9,417 (5,029) (2,996)
Balance at end of year $ 9,417 $ 1,392 $ 6,421
[1] Includes the results of FM O&G beginning June 1, 2013.