Common Stock (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended				6 Months Ended
	Jul. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Class of Stock [Line Items]
Treasury stock acquired (shares)		5,516,312		2,464,808		11,667,008	7,494,763
Value of treasury stock shares repurchased/withheld		$ 3,516	$ 3,652	$ 1,155	$ 2,352	$ 7,168	$ 3,507
Remaining authorized repurchase amount		$ 1,700				$ 1,700
Issuance of equity					$ 23		$ 23
Liberty Broadband
Class of Stock [Line Items]
Issuance of equity, shares							35,112
A/N
Class of Stock [Line Items]
Issuance of equity, shares							20,182
Share buybacks
Class of Stock [Line Items]
Treasury stock acquired (shares)		5,147,257		2,028,234		10,703,575	6,480,783
Value of treasury stock shares repurchased/withheld		$ 3,392		$ 1,026		$ 6,866	$ 3,202
Share buybacks | Liberty Broadband
Class of Stock [Line Items]
Treasury stock acquired (shares)		1,927,032				2,761,608
Value of treasury stock shares repurchased/withheld		$ 1,244				$ 1,762
Share buybacks | Liberty Broadband | Subsequent Event
Class of Stock [Line Items]
Treasury stock acquired (shares)	400,000
Value of treasury stock shares repurchased/withheld	$ 279
Income tax withholding
Class of Stock [Line Items]
Treasury stock acquired (shares)		183,357		247,651		467,920	583,305
Value of treasury stock shares repurchased/withheld		$ 124		$ 129		$ 302	$ 305
Exercise cost
Class of Stock [Line Items]
Treasury stock acquired (shares)		185,698		188,923		495,513	430,675