Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Acquisitions and Divestitures - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended
	Jan. 20, 2026 USD ($) state $ / shares	Oct. 17, 2024 USD ($)	Mar. 31, 2026 USD ($) segment state	Jan. 30, 2026 market	Dec. 31, 2025 USD ($)
Business Combination [Line Items]
Number of states in which wireline services are provided \| state	31
Number of reportable segments \| segment			2
Goodwill			$ 30,628		$ 22,841
Consumer
Business Combination [Line Items]
Number of states in which wireline services are provided \| state			31
Spectrum Licenses, United States Cellular Corporation (UScellular)
Business Combination [Line Items]
Asset acquisition, consideration transferred		$ 1,000
Frontier
Business Combination [Line Items]
Business acquisition, share price (in dollars per share) \| $ / shares	$ 38.50
Cash payment to Frontier's equity holders	$ 9,800
Cash proceeds from acquisition	335
Business combination, consideration transferred, liabilities incurred	12,900
Goodwill	7,759
Business combination, recognized asset acquired, benefit obligation assets	2,500
Business combination, recognized liability assumed, liability, employee benefit obligations	3,000
Business combination, integration and acquisition-related cost, expense			$ 261
Repayments of assumed debt			$ 6,400
Frontier \| Customer-Related Intangible Assets
Business Combination [Line Items]
Finite-lived intangible assets acquired	$ 2,600
Acquired finite-lived intangible assets, weighted average useful life	9 years
Frontier \| Technology-Based Intangible Assets
Business Combination [Line Items]
Finite-lived intangible assets acquired	$ 162
Acquired finite-lived intangible assets, weighted average useful life	3 years
Frontier \| Trade Names
Business Combination [Line Items]
Finite-lived intangible assets acquired	$ 100
Acquired finite-lived intangible assets, weighted average useful life	3 years
Frontier \| Consumer
Business Combination [Line Items]
Goodwill	$ 6,000
Frontier \| Business
Business Combination [Line Items]
Goodwill	$ 1,800
Starry Group Holdings, Inc.
Business Combination [Line Items]
Number of markets serviced \| market				5
Frontier and Starry
Business Combination [Line Items]
Business combination, aggregate acquired operating revenues, percentage of total operating revenues (less than)			5.00%