SUPPLEMENTAL QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Impairment of leasehold	$ 3,200	$ 21	$ 279	$ 23
Oil and gas production revenues	1,625	1,438	1,598	1,654	$ 1,703	$ 1,976	$ 1,936	$ 1,733	$ 6,411	$ 7,424	$ 6,423
Operating income (loss)	(2,893)	175	124	408	(204)	698	738	587	(2,186)	1,819	1,190
Net income (loss) before income taxes	(3,035)	14	(152)	165	(344)	406	508	388	(3,008)	958	918
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTERESTS	(3,247)	(117)	(316)	(2)	(350)	161	269	206	(3,682)	286	1,503
Net loss attributable to common stock	$ (2,976)	$ (170)	$ (360)	$ (47)	$ (381)	$ 81	$ 195	$ 145	$ (3,553)	$ 40	$ 1,304
Basic and diluted net loss per common share:
Basic net income (loss) per share (in USD per share)	$ (7.89)	$ (0.45)	$ (0.96)	$ (0.12)	$ (1.00)	$ 0.21	$ 0.51	$ 0.38	$ (9.43)	$ 0.11	$ 3.42
Diluted net income (loss) per share (in USD per share)	$ (7.89)	$ (0.45)	$ (0.96)	$ (0.12)	$ (1.00)	$ 0.21	$ 0.51	$ 0.38	$ (9.43)	$ 0.11	$ 3.41
Asset and leasehold impairments	$ 1,400				$ 639	$ 49	$ 21	$ 16	$ 2,949	$ 511	$ 8