Segment Disclosures and Related Information (Net Income (Loss) Attributable to ConocoPhillips, Investments In and Advances To Affiliates and Total Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	$ 8,079	$ (2,701)	$ 7,189
Investments in and advances to affiliates	6,701	7,710	8,453
Total Assets	90,661	62,618	70,514
Alaska [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	1,386	(719)	1,520
Investments in and advances to affiliates	58	62	83
Total Assets	14,812	14,623	15,453
Lower 48 [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	4,932	(1,122)	436
Investments in and advances to affiliates	242	25	35
Total Assets	41,699	11,932	14,425
Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	458	(326)	279
Investments in and advances to affiliates	0	0	0
Total Assets	7,439	6,863	6,350
Europe, Middle East and North Africa [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	1,167	448	3,170
Investments in and advances to affiliates	797	918	1,070
Total Assets	9,125	8,756	9,269
Asia Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	453	962	1,483
Investments in and advances to affiliates	5,603	6,705	7,265
Total Assets	9,840	11,231	13,568
Other International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	(107)	(64)	263
Investments in and advances to affiliates	1	0	0
Total Assets	1	226	285
Corporate and Other [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Consolidated net income (loss) attributable to ConocoPhillips	(210)	(1,880)	38
Investments in and advances to affiliates	0	0	0
Total Assets	$ 7,745	$ 8,987	$ 11,164