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Restructuring and Related Activities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | $ (48) | $ (72) | $ (104) | $ (72) |  |  |
Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  |  |  |  | $ 10 |  |
2023 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 3 | 72 | 10 | 72 |  |  |
Payments for Restructuring | (4) | (36) | (23) | (36) |  |  |
Restructuring Reserve, Settled without Cash | 0 | (5) | (4) | (5) |  |  |
Restructuring Reserve | 11 | $ 31 | 11 | $ 31 |  | $ 18 | $ 28
Employee headcount reduction |  | 15.00% |  | 15.00% |  |  |
2024 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 51 |  | 94 |  |  |  |
Payments for Restructuring | (30) |  | (33) |  |  |  |
Restructuring Reserve, Settled without Cash | 3 |  | 9 |  |  |  |
Restructuring Reserve | $ 52 |  | $ 52 |  |  | 34 | 0
Employee headcount reduction | 10.00% |  | 10.00% |  |  |  |
Restructuring Plans | Towers [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | $ 6 |  | $ 13 |  |  |  |
Restructuring Plans | Fiber [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 30 |  | 60 |  |  |  |
Restructuring Plans | Other Segments |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 12 |  | 31 |  |  |  |
Employee Severance | 2023 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 3 | $ 62 | 1 | $ 62 |  |  |
Payments for Restructuring | (1) | (35) | (13) | (35) |  |  |
Restructuring Reserve, Settled without Cash | 0 | 1 | 0 | 1 |  |  |
Restructuring Reserve | 2 | 26 | 2 | 26 |  | 6 | 16
Employee Severance | 2024 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 1 |  | 35 |  |  |  |
Payments for Restructuring | (27) |  | (30) |  |  |  |
Restructuring Reserve, Settled without Cash | 3 |  | 4 |  |  |  |
Restructuring Reserve | 9 |  | 9 |  |  | 34 | 0
Facility Closing | 2023 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 0 | 10 | 11 | 10 |  |  |
Payments for Restructuring | (3) | (1) | (10) | (1) |  |  |
Restructuring Reserve, Settled without Cash | 0 | 4 | 4 | 4 |  |  |
Restructuring Reserve | 9 | $ 5 | 9 | $ 5 |  | 12 | 12
Facility Closing | 2024 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges | 52 |  | 59 |  |  |  |
Payments for Restructuring | (3) |  | (3) |  |  |  |
Restructuring Reserve, Settled without Cash | 6 |  | 13 |  |  |  |
Restructuring Reserve | $ 43 |  | $ 43 |  |  | $ 0 | $ 0

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