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Investments In Affiliates Accounted For Using The Equity Method - SoundCloud (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Feb. 29, 2020
Investments in Affiliates Accounted for Using the Equity Method
Equity Method Investments	$ 1,016		$ 1,016		$ 1,018
SIRIUS XM Holdings | SoundCloud Holdings, LLC | Pandora Soundcloud Advertising Agreement
Investments in Affiliates Accounted for Using the Equity Method
Revenue share expense	15	$ 13	42	$ 36
Due to related parties, non-current	$ 19		$ 19
SIRIUS XM Holdings | SoundCloud Holdings, LLC
Investments in Affiliates Accounted for Using the Equity Method
Equity Method Investments						$ 75

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