Debt - Additional Information (Details)	12 Months Ended
Dec. 31, 2018
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	5.0

Our debt generally requires compliance with certain covenants that restrict our ability to, among other things, (i) incur additional indebtedness unless our consolidated leverage would be no greater than specified limits (which decide on time to time) the consolidated operating cash flow after the incurrence of the indebtedness.

No definition available.

Name:	siri_DebtInstrumentCovenantTermsMaximumConsolidatedLeverageRatio
Namespace Prefix:	siri_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration