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Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Deferred compensation contributions $ 1   $ 7 $ 7  
Fair value of investment assets related to deferred compensation plan 41   41   $ 34
Unrealized gains (losses) on investments $ 4 $ 1 $ (1) $ 3  
Maximum          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Deferred compensation contributions   $ 1