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Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Retirement Benefits [Abstract]          
Deferred compensation contributions $ 1 $ 1 $ 3 $ 8  
Fair value of investment assets related to deferred compensation plan 53   53   $ 46
Gains (losses) on investments $ (1) $ 2 $ 4 $ 1