Intangible Assets - Goodwill Rollforward (Details) $ in Millions  | 
3 Months Ended | 
|---|---|
| 
 Mar. 31, 2021  
USD ($) 
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| Goodwill | 听 | 
| Goodwill, Beginning Balance | $ 19,218 | 
| Acquisitions | 6 | 
| Goodwill, Ending Balance | 19,224 | 
| Sirius XM Holdings | 听 | 
| Goodwill | 听 | 
| Goodwill, Beginning Balance | 15,082 | 
| Acquisitions | 6 | 
| Goodwill, Ending Balance | 15,088 | 
| Formula 1 | 听 | 
| Goodwill | 听 | 
| Goodwill, Beginning Balance | 3,956 | 
| Goodwill, Ending Balance | 3,956 | 
| Other | 听 | 
| Goodwill | 听 | 
| Goodwill, Beginning Balance | 180 | 
| Goodwill, Ending Balance | $ 180 | 
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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