Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Summary of Restricted Stock Unit and Stock Award Activity (Details)

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Benefit Plans - Summary of Restricted Stock Unit and Stock Award Activity (Details) - Restricted Stock Units (RSUs) and Performance Shares - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Nonvested as of beginning of period (in shares) 35 31 30
Units granted in connection with Pandora Acquisition (in shares) 48    
Granted (in shares) 38 18 12
Vested (in shares) (38) (13) (9)
Forfeited (in shares) (8) (1) (2)
Nonvested as of end of period (in shares) 75 35 31
Grant Date Fair Value Per Share      
Nonvested as of beginning of period (in dollars per share) $ 5.50 $ 4.54 $ 4.03
Units granted in connection with Pandora Acquisition (in dollars per share) 5.83    
Granted (in dollars per share) 6.01 6.40 5.35
Vested (in dollars per share) 5.53 4.43 3.92
Forfeited (in dollars per share) 5.85 4.99 4.42
Nonvested as of end of period (in dollars per share) $ 5.95 $ 5.50 $ 4.54