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Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Retirement Benefits [Abstract] |  |  |
Deferred compensation contributions | $ 4 | $ 8 | $ 7
Fair value of investment assets related to deferred compensation plan | 56 | 46 |
Gains (losses) on investments | $ 5 | $ 3 | $ 3

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- Definition Deferred Compensation Arrangement with Individual, Gain (Loss) on Investment + References No definition available. + Details
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Namespace Prefix: | siri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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