Debt - Additional Information (Details) (Senior Secured Revolving Credit Facility [Member])	3 Months Ended
Mar. 31, 2015
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum consolidated leverage	500.00%

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:	num:percentItemType
Balance Type:	na
Period Type:	duration