Fair Value of Financial Instruments (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Input Level 2 | Carrying Amount | ||
| Fair Value Disclosure | ||
| Long-term debt (excluding finance leases) | $ 1,686 | $ 1,686 |
| Input Level 2 | Fair Value | ||
| Fair Value Disclosure | ||
| Long-term debt (excluding finance leases) | 1,281 | 1,261 |
| Input Level 3 | Carrying Amount | ||
| Fair Value Disclosure | ||
| Regulatory cost liability related to the sale of the Mass Markets Fiber-to-the-Home business | 18 | 0 |
| Input Level 3 | Fair Value | ||
| Fair Value Disclosure | ||
| Regulatory cost liability related to the sale of the Mass Markets Fiber-to-the-Home business | $ 18 | $ 0 |
| X | ||||||||||
- Definition Regulatory Liabilities, Fair Value Disclosure No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|