Consolidated Statement of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statement of Comprehensive Income [Abstract]
Net Income (Loss)		$ 8,079	$ (2,655)	$ 7,257
Defined benefit plans
Prior service credit arising during the period		0	29	0
Reclassification adjustment for amortization of prior service credit included in net income (loss)		(38)	(32)	(35)
Net change		(38)	(3)	(35)
Net actuarial gain (loss) arising during the period		357	(210)	(55)
Reclassification adjustment for amortization of net actuarial losses included in net income (loss)		178	117	146
Net change		535	(93)	91
Nonsponsored plans	[1]	5	1	(3)
Income taxes on defined benefit plans		(108)	20	(2)
Defined benefit plans, net of tax		394	(75)	51
Unrealized holding gain (loss) on securities		(2)	2	0
Reclassification adjustment for loss included in net income		(1)	0	0
Income taxes on unrealized holding loss on securities		1	0	0
Unrealized holding gain (loss) on securities, net of tax		(2)	2	0
Foreign currency translation adjustments		(124)	209	699
Income taxes on foreign currency translation adjustments		0	3	(4)
Foreign currency translation adjustments, net of tax		(124)	212	695
Other Comprehensive Income, Net of Tax		268	139	746
Comprehensive Income (Loss)		8,347	(2,516)	8,003
Less: comprehensive income attributable to noncontrolling interests		0	(46)	(68)
Comprehensive Income (Loss) Attributable to ConocoPhillips		$ 8,347	$ (2,562)	$ 7,935

[1] *Plans for which ConocoPhillips is not the primary obligor—primarily those administered by equity   affiliates.