XML 108 R91.htm IDEA: XBRL DOCUMENT v3.20.4

Benefit Plans - Other Plans (Details)	12 Months Ended
	Dec. 31, 2020 plan
Retirement Benefits [Abstract]
Number of other share-based benefit plans	6

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration