Future cash outflow to pay for purchases of fixed assets that have occurred.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-5

Debt - Narrative (Details)	1 Months Ended									12 Months Ended
Debt - Narrative (Details)	Feb. 17, 2026 USD ($)	Jan. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Nov. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Apr. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Feb. 28, 2025 USD ($)	Dec. 31, 2025 USD ($) agreement	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt										$ 27,600,000,000	$ 15,600,000,000
Repayments of debt and capital lease obligations										19,800,000,000	20,300,000,000
Repayments of debt										9,034,000,000
Proceeds from asset-backed long-term borrowings										9,338,000,000	12,422,000,000	$ 6,594,000,000
Facility Capacity			$ 23,950,000,000							23,950,000,000
Value of purchase assets financed										3,800,000,000	3,300,000,000
Less long-term debt maturing within one year			18,177,000,000							18,177,000,000	22,568,000,000
Net debt extinguishment gains										368,000,000	385,000,000	308,000,000
Frontier
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt										10,200,000,000
Verizon revolving credit facility
Debt Instrument [Line Items]
Amount drawn from credit facilities										0
Facility Capacity			12,000,000,000							12,000,000,000
Various export credit facilities
Debt Instrument [Line Items]
Amount drawn from credit facilities										270,000,000
Facility Capacity			11,950,000,000							11,950,000,000
Various export credit facilities \| Subsequent event
Debt Instrument [Line Items]
Amount drawn from credit facilities		$ 1,600,000,000
Pension
Debt Instrument [Line Items]
Defined contribution plan, employer discretionary contribution amount										1,300,000,000
Alternative Financing Facility \| Network Equipment
Debt Instrument [Line Items]
Value of purchase assets financed										2,100,000,000	1,600,000,000	$ 1,300,000,000
Less long-term debt maturing within one year			3,000,000,000							3,000,000,000	2,500,000,000
Asset-Backed Debt
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt										9,300,000,000	12,400,000,000
Repayments of debt										8,400,000,000	8,500,000,000
Secured debt, carrying value			27,100,000,000							27,100,000,000
Repurchase agreement, maximum amount authorized to sell			1,300,000,000		$ 750,000,000
Proceeds from (payments for) in securities sold under agreements to repurchase										1,300,000,000
Securities held as collateral, at fair value			1,800,000,000							1,800,000,000
Asset-Backed Debt \| Subsequent event
Debt Instrument [Line Items]
Repurchase agreement, maximum amount authorized to sell		2,500,000,000
Proceeds from (payments for) in securities sold under agreements to repurchase		1,300,000,000
Green Bond
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt											1,000,000,000
Commercial Paper
Debt Instrument [Line Items]
Proceeds from commercial paper										11,600,000,000
Repayments of short-term debt										11,600,000,000
Commercial paper, amount outstanding			0							0
Asset Backed Notes
Debt Instrument [Line Items]
Principal Amount Issued			5,943,000,000							5,943,000,000
Asset Backed Notes \| Senior asset-backed notes
Debt Instrument [Line Items]
Repayments of debt										$ 4,400,000,000	$ 4,500,000,000
Asset Backed Notes \| Senior asset-backed notes \| Subsequent event
Debt Instrument [Line Items]
Repayments of debt		1,000,000,000
Asset Backed Notes \| Term One \| Senior asset-backed notes
Debt Instrument [Line Items]
Debt revolving period										2 years
Asset Backed Notes \| Term Two \| Senior asset-backed notes
Debt Instrument [Line Items]
Debt revolving period										3 years
Asset Backed Notes \| Term Three \| Senior asset-backed notes
Debt Instrument [Line Items]
Debt revolving period										5 years
Retained Notes
Debt Instrument [Line Items]
Proceeds from asset-backed long-term borrowings										$ 523,000,000
2021 ABS Financing Facility \| Senior asset-backed notes
Debt Instrument [Line Items]
Repayments of debt				$ 750,000,000	$ 1,100,000,000	$ 200,000,000		$ 1,400,000,000	$ 250,000,000
Number of loan agreements \| agreement										2
Amount drawn from credit facilities						$ 125,000,000	$ 1,100,000,000
Outstanding balance			5,600,000,000							$ 5,600,000,000
2021 ABS Financing Facility \| Senior asset-backed notes \| Subsequent event
Debt Instrument [Line Items]
Amount drawn from credit facilities	$ 1,000,000,000	$ 2,300,000,000
2022 ABS Financing Facility \| Senior asset-backed notes
Debt Instrument [Line Items]
Repayments of debt							$ 241,000,000		$ 163,000,000
Amount drawn from credit facilities			241,000,000					$ 189,000,000
Outstanding balance			5,000,000,000							5,000,000,000
Guarantee of Debentures of Operating Telephone Company Subsidiaries
Debt Instrument [Line Items]
Principal amount outstanding in connection with the guarantee of debt obligations			$ 614,000,000							$ 614,000,000