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Goodwill (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
reporting_unit
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]        
Number of reporting units | reporting_unit     2  
Impairment losses for goodwill $ 0 $ 0 $ 0 $ 0
Accumulated impairment of goodwill since the merger $ 4,766,000,000   4,766,000,000  
Pandora        
Business Acquisition [Line Items]        
Goodwill acquired during period     $ 1,566,000,000