Acquisitions and Dispositions - Narrative (Details)		1 Months Ended									3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 15, 2021 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Feb. 28, 2022 USD ($)	Feb. 28, 2021 USD ($)	Jan. 31, 2021 USD ($)	Aug. 31, 2020 USD ($) a	May 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) a	Dec. 31, 2022 USD ($) $ / MMBTU $ / bbl	Dec. 31, 2021 USD ($) a	Dec. 31, 2021 USD ($) a	Dec. 31, 2020 USD ($)	May 27, 2020 USD ($)
Business Acquisition [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]													Gain (loss) from dispositions
Capitalized costs, proved properties												$ 114,274,000,000	$ 119,609,000,000	$ 114,274,000,000	$ 114,274,000,000
Capitalized costs, unproved properties												10,993,000,000	7,325,000,000	10,993,000,000	10,993,000,000
Income tax provision													9,548,000,000		4,633,000,000	$ (485,000,000)
Total revenues and other Income													82,156,000,000		48,349,000,000	19,256,000,000
Net Income (Loss) attributable to ConocoPhillips													18,680,000,000		8,079,000,000	(2,701,000,000)
Gain (loss) from dispositions													1,077,000,000		486,000,000	549,000,000
Asset retirement obligations												5,754,000,000	6,401,000,000	5,754,000,000	5,754,000,000
Assets Acquisition In The Lower 48 Segment
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 236,000,000
Lower 48
Business Acquisition [Line Items]
Before-tax gain (loss) on disposition												58,000,000
Proceeds from asset dispositions												250,000,000
Canada | Additional Montney acreage
Business Acquisition [Line Items]
Asset acquisition, assets acquired and liabilities assumed, net							$ 382,000,000
Asset acquisition, liabilities assumed							$ 31,000,000
Asset acquisition, undeveloped acreage acquired | a							140,000
Oil and gas, net underdeveloped acreage | a							295,000
Asset acquisition, percent of working interest acquired							100.00%
Property, plant and equipment, additions							$ 490,000,000
Asset retirement obligations							$ 77,000,000
Barossa Project | Asia Pacific
Business Acquisition [Line Items]
Before-tax gain (loss) on disposition											$ 200,000,000
Receivable in dispute																200,000,000
Proceeds from asset dispositions								$ 200,000,000
Noncore Exploration Interests
Business Acquisition [Line Items]
Before-tax gain (loss) on disposition												(179,000,000)
Waddell Ranch | Lower 48
Business Acquisition [Line Items]
Proceeds from asset dispositions										$ 184,000,000
Gain (loss) from dispositions										$ 0
Niobrara | Lower 48
Business Acquisition [Line Items]
Disposal group including discontinued operation, net carrying value, asset									$ 397,000,000
Disposal group including discontinued operation, net carrying value, PP&E									433,000,000
Proceeds from asset dispositions									359,000,000
Disposal group including discontinued operation, net carrying value, ARO									34,000,000
Gain on disposition of oil and gas property									$ 38,000,000
Losses before income taxes																25,000,000
Australia West Assets | Asia Pacific
Business Acquisition [Line Items]
Disposal group including discontinued operation, net carrying value, asset																	$ 200,000,000
Disposal group including discontinued operation, net carrying value, PP&E																	1,300,000,000
Disposal group including discontinued operation, net carrying value, cash and cash equivalents																	500,000,000
Proceeds from asset dispositions								$ 765,000,000
Disposal group including discontinued operation, net carrying value, ARO																	700,000,000
Gain on disposition of oil and gas property																587,000,000
Disposal group including discontinued operation, net carrying value, other assets																	100,000,000
Disposal group including discontinued operation, net carrying value, deferred tax liabilities																	300,000,000
Disposal group including discontinued operation, net carrying value, other liabilities																	$ 200,000,000
Before-tax earnings on subsidiaries sold																851,000,000
Certain Noncore Assets | Lower 48 | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Before-tax gain (loss) on disposition													0
Net carrying value													680,000,000
Disposal group including discontinued operation, net carrying value, asset													825,000,000
Disposal group including discontinued operation, net carrying value, PP&E													818,000,000
Disposal group, including discontinued operation, liabilities													145,000,000
Proceeds from asset dispositions													680,000,000
Subsidiaries Holding Indonesia Assets And Operations | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Before-tax gain (loss) on disposition			$ 534,000,000
Net carrying value			200,000,000
Disposal group including discontinued operation, net carrying value, PP&E			300,000,000
Gain (loss) on disposal, net of tax			462,000,000
Disposal group including discontinued operation, net carrying value, cash and cash equivalents			200,000,000
Disposal group, including discontinued operation, asset retirement obligation			100,000,000
Disposal group, including discontinued operation, income (loss) before taxes													138,000,000		604,000,000	394,000,000
Proceeds from asset dispositions			$ 731,000,000
Previous Dispositions | Canada and Lower 48
Business Acquisition [Line Items]
Disposal group, including discontinued operation, contingent payment													451,000,000		369,000,000	$ 0
Previous Dispositions | Lower 48
Business Acquisition [Line Items]
Contingent payment calculation, monthly payment													$ 7,000,000
Contingent payment calculation, threshold U.S. Henry Hub price | $ / MMBTU													3.20
Previous Dispositions | Canada
Business Acquisition [Line Items]
Contingent payment calculation, cost per one Canadian dollar													6,000,000
Threshold average crude price per barrel | $ / bbl													52
Australia Pacific APLNG
Business Acquisition [Line Items]
Additional ownership percentage in equity investment acquired				10.00%
Payments to acquire additional interest				$ 1,400,000,000
Ownership percentage in equity investment				47.50%									47.50%
QG8
Business Acquisition [Line Items]
Ownership percentage in equity investment													25.00%
Origin Energy | Australia Pacific APLNG
Business Acquisition [Line Items]
Investment, ownership percentage				27.50%
Sinopec | Australia Pacific APLNG
Business Acquisition [Line Items]
Investment, ownership percentage				25.00%
Subsidiaries Holding Indonesia Assets And Operations | Transasia Pipeline Company
Business Acquisition [Line Items]
Investment, ownership percentage			35.00%
Subsidiaries Holding Indonesia Assets And Operations | Indonesia Corridor Block Production Sharing Contract
Business Acquisition [Line Items]
Investment, ownership percentage			54.00%
QatarEnergy | QG8
Business Acquisition [Line Items]
Ownership percentage in equity investment													75.00%
QG8 | North Field East LNG Project
Business Acquisition [Line Items]
Investment, ownership percentage													12.50%
Concho Resources Incorporated
Business Acquisition [Line Items]
Total consideration	$ 13,100,000,000					$ 13,100,000,000								13,125,000,000
Exchange ratio	1.46					1.46
Capitalized costs, proved properties	$ 11,800,000,000
Capitalized costs, unproved properties	$ 6,900,000,000
Transaction Cost											$ 157,000,000			157,000,000
Total revenues and other Income														6,571,000,000
Net Income (Loss) attributable to ConocoPhillips														2,330,000,000
Concho Resources Incorporated | Commodity
Business Acquisition [Line Items]
Gain (Loss) on price risk derivative instruments not designated as hedging instruments, before tax														(305,000,000)
Gain (Loss) on price risk derivative instruments not designated as hedging instruments, after tax														(233,000,000)
Concho Resources Incorporated | Concho Resources Inc.
Business Acquisition [Line Items]
Income tax provision					$ 75,000,000
Oil and gas properties, impairment loss															10,500,000,000
Goodwill, impairment loss															1,900,000,000
Shell Permian Assets
Business Acquisition [Line Items]
Total consideration															8,600,000,000
Capitalized costs, proved properties												4,200,000,000		4,200,000,000	4,200,000,000
Capitalized costs, unproved properties												$ 4,300,000,000		$ 4,300,000,000	4,300,000,000
Transaction Cost															$ 44,000,000
Area of land | a												225,000		225,000	225,000