Segment Information (Tables)

6 Months Ended

Jun. 30, 2025

Segment Reporting [Abstract]

Schedule of Segment Results

The following tables summarize our segment results for the three and six months ended June 30, 2025 and 2024, based on the segment categorization under which we were operating at June 30, 2025.

	Three Months Ended June 30, 2025			Six Months Ended June 30, 2025
	Business		Mass Markets	Business	Mass Markets
	(Dollars in millions)
Segment revenue	$	2,490	602	5,014	1,260
Segment expenses
Cost of services and products	691		13	1,429	27
Headcount costs	294		142	580	292
Non-headcount costs	353		130	687	243
Total segment expense	1,338		285	2,696	562
Total segment adjusted EBITDA	$	1,152	317	2,318	698

	Three Months Ended June 30, 2024			Six Months Ended June 30, 2024
	Business		Mass Markets	Business	Mass Markets
	(Dollars in millions)
Segment revenue	$	2,578	690	5,169	1,389
Segment expenses
Cost of services and products	761		20	1,499	37
Headcount costs	304		155	648	322
Non-headcount costs	349		139	690	271
Total segment expense	1,414		314	2,837	630
Total segment adjusted EBITDA	$	1,164	376	2,332	759

Schedule of Reconciliation of Segment Adjusted EBITDA to Net (Loss) Income

The following table reconciles total segment adjusted EBITDA to net (loss) income for the three and six months ended June 30, 2025 and 2024:

	Three Months Ended June 30,			Six Months Ended June 30,
	2025		2024	2025	2024
	(Dollars in millions)
Total segment adjusted EBITDA	$	1,469	1,540	3,016	3,091
Depreciation and amortization	(688)		(743)	(1,401)	(1,491)
Goodwill impairment	(628)		—	(628)	—
Other unallocated expense	(744)		(665)	(1,461)	(1,409)
Stock-based compensation (expense) credit	(12)		3	(22)	(11)
Operating (loss) income	(603)		135	(496)	180
Total other expense, net	(546)		(176)	(898)	(119)
(Loss) income before taxes	(1,149)		(41)	(1,394)	61
Income tax (benefit) expense	(234)		8	(278)	53
Net (loss) income	$	(915)	(49)	(1,116)	8