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Segment Information (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Schedule of Segment Results

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

			Three Months Ended September 30, 2025												Nine Months Ended September 30, 2025
			Business						Mass Markets						Business						Mass Markets
			(Dollars in millions)
Segment revenue			$	2,456					631						7,470						1,891
Segment expenses
Cost of services and products			691						13						2,120						40
Headcount costs			294						142						874						434
Non-headcount costs			363						129						1,050						372
Total segment expense			1,348						284						4,044						846
Total segment adjusted EBITDA			$	1,108					347						3,426						1,045

			Three Months Ended September 30, 2024												Nine Months Ended September 30, 2024
			Business						Mass Markets						Business						Mass Markets
			(Dollars in millions)
Segment revenue			$	2,537					684						7,706						2,073
Segment expenses
Cost of services and products			766						16						2,265						53
Headcount costs			300						162						948						484
Non-headcount costs			371						149						1,061						420
Total segment expense			1,437						327						4,274						957
Total segment adjusted EBITDA			$	1,100					357						3,432						1,116

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

The following table reconciles total segment adjusted EBITDA to net loss for the three and nine months ended September 30, 2025 and 2024:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
			(Dollars in millions)
Total segment adjusted EBITDA			$	1,455					1,457						4,471						4,548
Depreciation and amortization			(674)						(707)						(2,075)						(2,198)
Goodwill impairment			—						—						(628)						—
Other unallocated expense			(884)						(614)						(2,345)						(2,023)
Stock-based compensation expense			(13)						(10)						(35)						(21)
Operating (loss) income			(116)						126						(612)						306
Total other expense, net			(697)						(298)						(1,595)						(417)
Loss before income taxes			(813)						(172)						(2,207)						(111)
Income tax (benefit) expense			(192)						(24)						(470)						29
Net loss			$	(621)					(148)						(1,737)						(140)

X

- Definition

Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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