INCOME TAXES (Reserve for Unrecognized tax benefits, interest and penalties) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Decreases:
Amount of unrecognized tax benefit that could impact provision for income taxes	$ 97
Amount of unrecognized tax benefit that could impact provision for income taxes, net of tax benefits	49
Unrecognized Tax Benefits [Member]
Reserve for unrecognized tax benefits, interest and penalties, type [Line Items]
Unrecognized Tax Benefits, Interest and Penalties, Beginning Balance	138	146
Additions:
Prior year tax positions	18	17
Current year tax positions	14	24
Acquisition of PXP	5
Interest and penalties	0	0
Decreases:
Prior year tax positions	(37)	(37)
Current year tax positions	0	0
Settlements with tax authorities	0	(11)
Lapse of statute of limitations	(28)	(1)
Interest and penalties	0	0
Unrecognized Tax Benefits, Interest and Penalties, Ending Balance	110	138
Interest [Member]
Reserve for unrecognized tax benefits, interest and penalties, type [Line Items]
Unrecognized Tax Benefits, Interest and Penalties, Beginning Balance	31	34
Additions:
Interest and penalties	7	3
Decreases:
Interest and penalties	(17)	(6)
Unrecognized Tax Benefits, Interest and Penalties, Ending Balance	21	31
Penalties [Member]
Reserve for unrecognized tax benefits, interest and penalties, type [Line Items]
Unrecognized Tax Benefits, Interest and Penalties, Beginning Balance	0	0
Additions:
Interest and penalties	0	0
Decreases:
Interest and penalties	0	0
Unrecognized Tax Benefits, Interest and Penalties, Ending Balance	$ 0	$ 0