BUSINESS SEGMENTS (Revenues by Geographic Area of Customer) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended															12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues by geographic area of customer [Line Items]
Revenues	$ 5,235	[1]	$ 5,696	[1]	$ 5,522	[1]	$ 4,985	[1]	$ 5,885	[2]	$ 6,165	[2]	$ 4,288	[2]	$ 4,583	$ 21,438	[1],[3]	$ 20,921	[2],[3]	$ 18,010	[3]
United States [Member]
Revenues by geographic area of customer [Line Items]
Revenues																10,311	[3]	9,418	[3]	6,285	[3]
Japan [Member]
Revenues by geographic area of customer [Line Items]
Revenues																1,573	[3]	2,141	[3]	2,181	[3]
Indonesia [Member]
Revenues by geographic area of customer [Line Items]
Revenues																1,792	[3]	1,651	[3]	2,054	[3]
Spain [Member]
Revenues by geographic area of customer [Line Items]
Revenues																1,208	[3]	1,223	[3]	1,581	[3]
Switzerland [Member]
Revenues by geographic area of customer [Line Items]
Revenues																800	[3]	1,098	[3]	731	[3]
China [Member]
Revenues by geographic area of customer [Line Items]
Revenues																968	[3]	1,078	[3]	579	[3]
Chile [Member]
Revenues by geographic area of customer [Line Items]
Revenues																687	[3]	754	[3]	704	[3]
Turkey [Member]
Revenues by geographic area of customer [Line Items]
Revenues																484	[3]	341	[3]	345	[3]
Korea [Member]
Revenues by geographic area of customer [Line Items]
Revenues																383	[3]	297	[3]	525	[3]
Other [Member]
Revenues by geographic area of customer [Line Items]
Revenues																$ 3,232	[3]	$ 2,920	[3]	$ 3,025	[3]

[1] Includes credits (charges) of $15 million ($9 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $(7) million ($(4) million to net income attributable to common stockholders) in the second quarter, $122 million ($76 million to net income attributable to common stockholders or $0.07 per share) in the third quarter, $497 million ($309 million to net loss attributable to common stockholders or $0.30 per share) in the fourth quarter and $627 million ($389 million to net loss attributable to common stockholders or $0.37 per share) for the year for net unrealized and noncash realized gains (losses) on crude oil and natural gas derivative contracts.

[2] Includes charges of $36 million ($23 million to net income attributable to common stockholders or $0.02 per share) in the second quarter, $158 million ($98 million to net income attributable to common stockholders or $0.09 per share) in the third quarter, $118 million ($73 million to net income attributable to common stockholders or $0.07 per share) in the fourth quarter and $312 million ($194 million to net income attributable to common stockholders or $0.19 per share) for the year (reflecting the seven-month period from June 1, 2013, to December 31, 2013) for unrealized and noncash realized losses on crude oil and natural gas derivative contracts.

[3] Revenues are attributed to countries based on the location of the customer.