Restructuring and Acquisition Related Expenses (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 2	$ 3
Andrew Page [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	1	$ 2
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	5
2020 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	2
2020 Global Restructuring Program [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	60
2020 Global Restructuring Program [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	50
2019 Global Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	3		$ 37
Restructuring and Related Cost, Expected Cost	45
1 LKQ Europe Program [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	55
1 LKQ Europe Program [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	45
2019 Global Restructuring Program [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining	$ 5