Benefit Plans - Other Plans (Details)	6 Months Ended
Jun. 30, 2020 plan
Retirement Benefits [Abstract]
Number of other share-based benefit plans	6

Share-based compensation arrangement by share-based payment award, number of share-based benefit plans.

No definition available.

Name:	siri_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfShareBasedBenefitPlans
Namespace Prefix:	siri_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration