Investment in Charter Accounted for Using the Equity Method - Charter condensed consolidated statements of operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments in affiliates accounted for using the Equity Method
Operating income (loss)	$ (8)	$ (11)	$ (31)	$ (29)
Other income (expense), net	(5)	2	(3)	11
Income tax benefit (expense)		(32)		(144)
Net earnings (loss)	(154)	142	497	578
Net earnings (loss) attributable to Liberty Broadband shareholders	(154)	142	497	578
Charter.
Investments in affiliates accounted for using the Equity Method
Revenue	13,672	13,795	41,173	41,159
Operating costs and expenses (excluding depreciation and amortization)	8,262	8,294	24,686	24,863
Depreciation and amortization	2,160	2,145	6,517	6,505
Other operating (income) expense, net	119	21	323	62
Total operating costs and expenses	10,541	10,460	31,526	31,430
Operating income (loss)	3,131	3,335	9,647	9,729
Interest expense, net	(1,268)	(1,311)	(3,772)	(3,955)
Other income (expense), net	(129)	(144)	(378)	(318)
Income tax benefit (expense)	(418)	(406)	(1,277)	(1,279)
Net earnings (loss)	1,316	1,474	4,220	4,177
Less: Net income attributable to noncontrolling interests	(179)	(194)	(565)	(560)
Net earnings (loss) attributable to Liberty Broadband shareholders	$ 1,137	$ 1,280	$ 3,655	$ 3,617