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Business Combinations (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 28, 2019
Jun. 30, 2020
Dec. 31, 2019
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill   $ 4,910 $ 4,929
Motors.co.uk      
Business Acquisition [Line Items]      
Purchase consideration $ 93    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill 65    
Purchased intangible assets 30    
Net liabilities (2)    
Total $ 93