SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Costs Incurred) (Details) (USD $) In Millions, unless otherwise specified	7 Months Ended
	Dec. 31, 2013
Property acquisition costs:
Proved properties	$ 12,205	[1]
Unproved properties	11,259	[2]
Exploration costs	502
Development costs	854
Total	24,820
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Oil and Gas Properties, Subject to Depletion	12,203
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Oil and Gas Properties, Not Subject to Depletion	$ 11,087

[1] Included $12.2 billion from the acquisitions of PXP and MMR.

[2] Included $11.1 billion from the acquisitions of PXP and MMR.