Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details)

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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Deferred compensation contributions     $ 7 $ 7  
Fair value of investment assets related to deferred compensation plan $ 31   31   $ 22
Unrealized gains (losses) on investments 0 $ 0 $ 0 $ 0  
Maximum          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Deferred compensation contributions $ 1 $ 1