Restructuring and Acquisition Related Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 4	$ 3	$ 5	$ 6
Andrew Page [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		1		$ 3
2020 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	25		27
2020 Global Restructuring Program [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	75		75
2020 Global Restructuring Program [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	65		65
2019 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	2		5		$ 37
Restructuring and Related Cost, Expected Cost	45		45
2019 Global Restructuring Program [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	4		4
2019 Global Restructuring Program [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	2		2
1 LKQ Europe Program [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	55		55
1 LKQ Europe Program [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	45		45
Cost of Sales [Member] | 2020 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	6
Restructuring Charges And Business Combination Acquisition Related Costs [Member] | 2019 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		$ 5
Specialty [Member] | 2020 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	1		1
Restructuring and Related Cost, Cost Incurred to Date	1		1
Specialty [Member] | 2019 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	1		1
North America [Member] | 2020 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	28		28
Restructuring and Related Cost, Cost Incurred to Date	17		17
North America [Member] | 2019 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	14		14
Europe [Member] | 2020 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	40		40
Restructuring and Related Cost, Cost Incurred to Date	10		10
Europe [Member] | 2019 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 27		$ 27