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Background - Change in Accounting Estimates and Correction of Immaterial Errors (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jan. 01, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Change in Accounting Estimate [Line Items] |  |  |  |  |
Retained Earnings (Accumulated Deficit) | $ 1,437 | $ 1,437 |  | $ 706 |
Fiber Network Assets |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 30 years | 25 years |
Fiber Network Assets | Change in Accounting Method Accounted for as Change in Estimate |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Depreciation | (6) | (12) |  |  |
Depreciation, Net Of Tax | (4) | (9) |  |  |
Competitive Local Exchange Carriers Fixed Assets | Change in Accounting Method Accounted for as Change in Estimate |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Depreciation | (24) | (48) |  |  |
Depreciation, Net Of Tax | $ (18) | $ (36) |  |  |
Correction Of Error From Understatement Of Revenues And Network Expenses Prior To 2021 |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  | $ 13

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