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Stock-Based Compensation Schedule of Unvested Restricted Stock Units Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Weighted Average Fair Value [Abstract]      
Fair value of RSUs vested during the period $ 8    
RSUs      
Shares Outstanding [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1.6   1.4
RSUs granted, shares 0.6    
RSUs vested, shares (0.4)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number 1.4    
lkq_expected_to_vest_other_than_options_weighted_average_per_share $ 40.33    
Weighted Average Fair Value [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value 40.24   $ 34.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 48.97 $ 38.52  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 34.23    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 3 years 2 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 62    
Fair value of RSUs vested during the period $ 18    
RSUs | Maximum      
Weighted Average Fair Value [Abstract]      
Vesting period 5 years    
Performance Based RSU [Member]      
Shares Outstanding [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 0.4   0.5
RSUs granted, shares 0.1    
RSUs vested, shares (0.2)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number 0.4    
lkq_expected_to_vest_other_than_options_weighted_average_per_share $ 38.32    
Weighted Average Fair Value [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value 38.32   $ 31.96
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 48.92 $ 38.50  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 27.75    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 1 year 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 18    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period 3 years    
Performance Shares [Member] | Maximum      
Weighted Average Fair Value [Abstract]      
Reporting period of positive diluted earnings per share 5 years