Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock, Common [Member]	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of April 1, 2022		320.9
Balance as of April 1, 2022	$ 5,671	$ 3	$ (469)	$ 1,444	$ 4,776	$ (99)	$ 16
Balance as of April 1, 2022 at Dec. 31, 2020			(17.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	571				571
Net income attributable to continuing noncontrolling interest	(1)						(1)
Other comprehensive loss	(2)
Purchase of treasury stock			7.7
Purchase of treasury stock	(361)		$ (361)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		0.4
Vesting of restricted stock units, net of shares withheld for employee tax	(2)			(2)
Stock-based compensation expense	17			17
Balance as of June 30, 2022 at Jun. 30, 2021			(25.0)
Balance as of June 30, 2022 at Jun. 30, 2021		321.3
Balance as of June 30, 2022 at Jun. 30, 2021	5,895	$ 3	$ (830)	1,459	5,347	(101)	17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	572
Balance as of April 1, 2022		321.2
Balance as of April 1, 2022	5,859	$ 3	$ (526)	1,450	5,042	(126)	16
Balance as of April 1, 2022 at Mar. 31, 2021			(18.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	305				305
Net income attributable to continuing noncontrolling interest	(1)						(1)
Other comprehensive loss	25					25
Purchase of treasury stock			6.2
Purchase of treasury stock	(304)		$ (304)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		0.1
Vesting of restricted stock units, net of shares withheld for employee tax	0
Stock-based compensation expense	9			9
Balance as of June 30, 2022 at Jun. 30, 2021			(25.0)
Balance as of June 30, 2022 at Jun. 30, 2021		321.3
Balance as of June 30, 2022 at Jun. 30, 2021	5,895	$ 3	$ (830)	1,459	5,347	(101)	17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	306
Balance as of April 1, 2022		321.3
Balance as of April 1, 2022	5,895	$ 3	(830)	1,459	5,347	(101)	17
Balance as of April 1, 2022		321.6
Balance as of April 1, 2022	5,787	$ 3	$ (1,346)	1,474	5,794	(153)	15
Balance as of April 1, 2022 at Dec. 31, 2021			(34.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	693				693
Net income attributable to continuing noncontrolling interest	0
Other comprehensive loss	(202)					(202)
Purchase of treasury stock			10.8
Purchase of treasury stock	(548)		$ (548)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		0.4
Vesting of restricted stock units, net of shares withheld for employee tax	(5)			(5)
Stock-based compensation expense	23			23
Dividends declared to LKQ stockholders ($0.25 per share)	(143)				(143)
Balance as of June 30, 2022 at Jun. 30, 2022			(45.4)
Balance as of June 30, 2022 at Jun. 30, 2022		322.0
Balance as of June 30, 2022 at Jun. 30, 2022	5,605	$ 3	$ (1,894)	1,492	6,344	(355)	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	693
Balance as of April 1, 2022		322.0
Balance as of April 1, 2022	5,799	$ 3	$ (1,490)	1,482	5,995	(206)	15
Balance as of April 1, 2022 at Mar. 31, 2022			(37.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	420				420
Net income attributable to continuing noncontrolling interest	0
Other comprehensive loss	(149)					(149)
Purchase of treasury stock			(8.1)
Purchase of treasury stock	(404)		$ (404)
Stock-based compensation expense	10			10
Dividends declared to LKQ stockholders ($0.25 per share)	(71)				(71)
Balance as of June 30, 2022 at Jun. 30, 2022			(45.4)
Balance as of June 30, 2022 at Jun. 30, 2022		322.0
Balance as of June 30, 2022 at Jun. 30, 2022	5,605	$ 3	$ (1,894)	1,492	6,344	(355)	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	420
Balance as of April 1, 2022		322.0
Balance as of April 1, 2022	$ 5,605	$ 3	$ (1,894)	$ 1,492	$ 6,344	$ (355)	$ 15