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v3.20.4

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

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