Sirius XM Holdings Inc. Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Capital Return Program (Details) - USD ($) $ / shares in Units, shares in Thousands						1 Months Ended	12 Months Ended
	Jan. 23, 2018	Oct. 03, 2017	Jul. 11, 2017	Apr. 25, 2017	Jan. 24, 2017	Jan. 29, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Common stock repurchased, value							$ 1,403,283,000	$ 1,672,697,000	$ 2,015,947,000
Dividends declared per common share (in dollars per share)		$ 0.011	$ 0.01	$ 0.01	$ 0.01		$ 0.041	$ 0.01	$ 0
Common Stock
Subsequent Event [Line Items]
Stock repurchase program, aggregate authorized amount							$ 10,000,000,000
Open Market
Subsequent Event [Line Items]
Common stock repurchased (in shares)							270,527	420,111	524,222
Common stock repurchased, value							$ 1,403,283,000	$ 1,672,697,000	$ 2,015,947,000
Subsequent Event
Subsequent Event [Line Items]
Dividends declared per common share (in dollars per share)	$ 0.011
Subsequent Event \| Common Stock
Subsequent Event [Line Items]
Stock repurchase program, additional authorized amount	$ 2,000,000,000
Stock repurchase program, aggregate authorized amount	$ 12,000,000,000
Subsequent Event \| Open Market
Subsequent Event [Line Items]
Common stock repurchased (in shares)						36,840
Common stock repurchased, value						$ 202,006,000