Earnings per Share - Additional Information (Details) - shares		3 Months Ended		6 Months Ended
	Feb. 01, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Participating securities (in shares)		0	0	0	0
Anti-dilutive common stock equivalents (in shares)		77,000,000	88,000,000	60,000,000	71,000,000
Common Stock | Pandora
Business Acquisition [Line Items]
Common stock issued (in shares)	392,000,000			392,000,000