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Summary of Significant Accounting Policies - Revenue recognition - Disaggregation of revenue - SIRIUS XM (Details)

v3.19.3.a.u2

Summary of Significant Accounting Policies - Revenue recognition - Disaggregation of revenue - SIRIUS XM (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue disaggregated by source	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Revenue	$ 2,619	$ 2,856	$ 2,805	$ 2,012	$ 2,009	$ 2,315	$ 2,199	$ 1,517	$ 10,292	$ 8,040	$ 7,594
Sirius XM Holdings	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Revenue disaggregated by source	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Revenue	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	$ 7,794	5,771	Ìý
Activation fees, recognition period	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	1 month	Ìý	Ìý
Sirius XM Holdings | Minimum	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Revenue disaggregated by source	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý
Subscription period	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	Ìý	3 months	Ìý	Ìý