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Restructuring and Related Activities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | $ 45 | $ 0 | $ 56 |  |  |
Towers [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 6 |  |  |  |  |
Fiber [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 31 |  |  |  |  |
Other Segments |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 19 |  |  |  |  |
Forecast |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  | $ 70 |  |
2023 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 2 |  | 13 |  |  |
Payments for Restructuring | (7) |  | (19) |  |  |
Restructuring Reserve, Settled without Cash | 0 |  | (4) |  |  |
Restructuring Reserve | 18 |  | 18 |  | $ 23 | $ 28
Employee headcount reduction |  | 15.00% |  |  |  |
2024 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 43 |  | 43 |  |  |
Payments for Restructuring | (2) |  | (2) |  |  |
Restructuring Reserve, Settled without Cash | (7) |  | (7) |  |  |
Restructuring Reserve | $ 34 |  | $ 34 |  |  |
Employee headcount reduction | 10.00% |  | 10.00% |  |  |
Employee Severance | 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | $ 1 |  | $ 1 |  |  |
Payments for Restructuring | (3) |  | (11) |  |  |
Restructuring Reserve, Settled without Cash | 0 |  | 0 |  |  |
Restructuring Reserve | 6 |  | 6 |  | 8 | 16
Employee Severance | 2024 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 36 |  | 36 |  |  |
Payments for Restructuring | (2) |  | (2) |  |  |
Restructuring Reserve, Settled without Cash | 0 |  | 0 |  |  |
Restructuring Reserve | 34 |  | 34 |  |  |
Facility Closing | 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 1 |  | 12 |  |  |
Payments for Restructuring | (4) |  | (8) |  |  |
Restructuring Reserve, Settled without Cash | 0 |  | (4) |  |  |
Restructuring Reserve | 12 |  | 12 |  | $ 15 | $ 12
Facility Closing | 2024 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges | 7 |  | 7 |  |  |
Payments for Restructuring | 0 |  | 0 |  |  |
Restructuring Reserve, Settled without Cash | (7) |  | (7) |  |  |
Restructuring Reserve | $ 0 |  | 0 |  |  |
Accelerated depreciation and asset write downs | 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (4) |  |  |
Accelerated depreciation and asset write downs | 2024 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (7) |  |  |
Remaining obligations under facility leases | 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  | $ 8 |  |  |

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