Stock-Based Compensation - Outstanding Awards and Exercises (Details) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) $ / shares shares
Awards | Common stock, all series
Compensation cost not yet recognized
Shares reserved for future issuance upon exercise of stock options	2,800
Employee Stock Option
Options
Granted (in shares)	0
Compensation cost not yet recognized
Unrecognized compensation cost options | $	$ 6
Period over which unrecognized compensation cost will be recognized	1 year 9 months 18 days
Employee Stock Option | Series A common stock
Options
Outstanding at the end (in shares)	0
Employee Stock Option | Series B common stock
Options
GCI Divestiture adjustment (in shares)	1
Outstanding at the end (in shares)	14
Exercisable at the end (in shares)	14
Expired	83
WAEP
WAEP options GCI divestiture adjustment (in dollars per share) | $ / shares	$ 93.27
WAEP Outstanding at the end (in dollars per share) | $ / shares	93.27
WAEP options expired | $ / shares	$ 93.13
Options additional disclosures
Weighted average remaining contractual life outstanding	4 months 24 days
Aggregate intrinsic value outstanding | $	$ 0
Employee Stock Option | Series C common stock
Options
Outstanding at the beginning (in shares)	2,649
Exercised (in shares)	(71)
GCI Divestiture adjustment (in shares)	192
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Other Increases (Decreases) in Period, Description	GCI Divestiture adjustment
Outstanding at the end (in shares)	2,770
Exercisable at the end (in shares)	2,534
WAEP
WAEP Outstanding at the beginning (in dollars per share) | $ / shares	$ 120.8
WAEP options exercised (in dollars per share) | $ / shares	77.82
WAEP options GCI divestiture adjustment (in dollars per share) | $ / shares	113.54
WAEP Outstanding at the end (in dollars per share) | $ / shares	113.54
WAEP options exercisable (in dollars per share) | $ / shares	$ 117.39
Options additional disclosures
Weighted average remaining contractual life outstanding	2 years 9 months 18 days
Weighted average remaining contractual life exercisable	2 years 7 months 6 days
Aggregate intrinsic value outstanding | $	$ 2
Aggregate intrinsic value exercisable | $	$ 2