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v3.20.2

Benefit Plans - Other Plans (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 shares | Sep. 30, 2020 plan
Retirement Benefits [Abstract] |  |
Number of other share-based benefit plans | plan |  | 6
Granted (in shares) | shares | 0 |

X
- Definition Share-based compensation arrangement by share-based payment award, number of share-based benefit plans. + References No definition available. + Details
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Namespace Prefix: | siri_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration