SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Capitalized Costs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			7 Months Ended	12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Supplementary Oil and Gas Information [Abstract]
Properties subject to amortization	$ 16,547			$ 13,829	$ 16,547		$ 13,829
Accumulated amortization	(7,360)	[1]		(1,357)	(7,360)	[1]	(1,357)
Total	9,187			12,472	9,187		12,472
Impairment of Oil and Gas Properties	$ 3,400		$ 308	$ 0	$ 3,737		$ 0	$ 0
Average Depletion Depreciation and Amortization Expense Per Unit of Production				35.54	39.74

[1] Includes charges of $3.7 billion to reduce the carrying value of oil and gas properties pursuant to full cost accounting rules.