Segment Information - Additional Information (Detail)	9 Months Ended
Sep. 30, 2023 segment customer_group state	Dec. 31, 2022 customer_group
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	2
Number of customer groups \| customer_group	3	4
Consumer
Segment Reporting Information [Line Items]
Number of states in which wireline services are provided \| state	9

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-18

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration