Consolidated Income Statement - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Revenues and Other Income
Sales and other operating revenues	$ 9,449	$ 6,688		$ 26,751	$ 20,987
Equity in earnings (losses) of affiliates	294	196		767	574
Gain on Dispositions	113	246		175	2,144
Other income	309	65		673	143
Total Revenues and Other Income	10,165	7,195		28,366	23,848
Costs and Expenses
Purchased commodities	3,530	2,926		10,308	9,040
Production and operating expenses	1,367	1,222	[1],[2]	3,851	3,838	[1],[2]
Selling, general and administrative expenses	119	110	[1],[2]	336	302	[1],[2]
Exploration expenses	103	73	[1],[2]	267	720	[1],[2]
Depreciation, depletion and amortization	1,494	1,608		4,344	5,212
Impairments	44	6		21	6,475
Taxes other than Income Taxes	312	175		768	604
Accretion on discounted liabilities	89	89		266	276
Interest and debt expense	186	251		547	872
Foreign currency transaction (gains) losses	5	5		7	28
Other Expense	10	77	[1]	350	421	[1]
Total Costs and Expenses	7,259	6,542		21,065	27,788
Income (Loss) before income taxes	2,906	653		7,301	(3,940)
Income tax provision (benefit)	1,033	217		2,874	(1,549)
Net income (loss)	1,873	436		4,427	(2,391)
Less: net income attributable to noncontrolling interests	(12)	(16)		(38)	(43)
Net Income (Loss) Attributable to ConocoPhillips	$ 1,861	$ 420		$ 4,389	$ (2,434)
Earnings Per Share, Basic [Abstract]
Earnings Per Share, Basic	$ 1.6	$ 0.35		$ 3.74	$ (1.98)
Earnings Per Share, Diluted [Abstract]
Earnings Per Share, Diluted	1.59	0.34		3.72	(1.98)
Dividends Paid Per Share of Common Stock (dollars)	$ 0.29	$ 0.27		$ 0.86	$ 0.8
Average Common Shares Outstanding (in thousands)
Basic	1,163,033	1,212,454		1,171,673	1,230,742
Diluted	1,172,694	1,215,341		1,180,774	1,230,742

[1] *Certain amounts have been reclassified to conform to the current-period presentation resulting from the adoption of ASU No. 2017-07.

[2] See Note 2—Changes in Accounting Principles, for additional information.