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Commitments And Contingencies (Narrative) (Details) $ in Millions |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 30, 2020 USD ($) item state | Sep. 30, 2025 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2024 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |
Accounts payable and accrued liabilities |  | $ 1,249 |  | $ 1,033
Accounts payable |  | 971 |  | $ 758
Capital expenditure associated with vendor financing payments |  | $ 16 |  |
RDOF Program, Phase I [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Awarded amount | $ 371 |  |  |
Period to build gigabit capable broadband | 10 years |  |  |
Number of location to build gigabit capable broadband | item | 127,000 |  |  |
Number of states to build gigabit capable broadband | state | 8 |  |  |
RDOF Program, Phase II [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Annual support offered by the Federal Communications Commission |  |  | $ 313 |
Minimum [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Terms of lease arrangements |  | 1 year |  |
Maximum [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Terms of lease arrangements |  | 99 years |  |
Vendor financing liabilities included in other current liabilities |  | $ 0 |  |

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