CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues and Other
Oil and condensate sales	$ 1,125	$ 1,616	$ 1,975	$ 3,035
Natural-gas sales	320	487	686	1,128
Natural-gas liquids sales	235	229	413	461
Gathering, processing, and marketing sales	305	305	545	598
Gains (losses) on divestitures and other, net	(70)	(1)	(30)	(265)
Total	1,915	2,636	3,589	4,957
Costs and Expenses
Oil and gas operating	202	226	410	522
Oil and gas transportation	246	283	488	588
Exploration	76	103	202	1,186
Gathering, processing, and marketing	252	255	467	509
General and administrative	305	278	754	585
Depreciation, depletion, and amortization	984	1,214	2,133	2,470
Other taxes	157	151	274	333
Impairments	18	30	34	2,813
Other operating expense	7	6	23	69
Total	2,247	2,546	4,785	9,075
Operating Income (Loss)	(332)	90	(1,196)	(4,118)
Other (Income) Expense
Interest expense	217	201	437	417
Loss on early extinguishment of debt	124	0	124	0
(Gains) losses on derivatives, net	311	(310)	610	(158)
Other (income) expense, net	(55)	15	(55)	62
Total	593	(95)	1,110	325
Income (Loss) Before Income Taxes	(925)	185	(2,306)	(4,443)
Income tax expense (benefit)	(314)	77	(697)	(1,315)
Net Income (Loss)	(611)	108	(1,609)	(3,128)
Net income (loss) attributable to noncontrolling interests	81	47	117	79
Net Income (Loss) Attributable to Common Stockholders	$ (692)	$ 61	$ (1,726)	$ (3,207)
Per Common Share
Net income (loss) attributable to common stockholders—basic	$ (1.36)	$ 0.12	$ (3.39)	$ (6.32)
Net income (loss) attributable to common stockholders—diluted	$ (1.36)	$ 0.12	$ (3.39)	$ (6.32)
Average Number of Common Shares Outstanding—Basic	510	508	510	507
Average Number of Common Shares Outstanding—Diluted	510	509	510	507
Dividends (per common share)	$ 0.05	$ 0.27	$ 0.10	$ 0.54
Commodity Contract and Interest Rate Swap [Member]
Other (Income) Expense
(Gains) losses on derivatives, net	$ 307	$ (311)	$ 604	$ (159)
Tronox Litigation [Member] | Judicial Ruling [Member]
Other (Income) Expense
Tronox-related contingent loss	$ 0	$ 0	$ 0	$ 5