Revenue Recognition - Contract Costs (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Acquisition Costs | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Beginning of period balance | $ 48 | $ 57 | $ 51 | $ 58 |
| Cost Incurred | 6 | 9 | 11 | 19 |
| Amortization | (8) | (10) | (16) | (21) |
| Change in contract costs held for sale | 0 | 0 | ||
| End of period balance | 46 | 56 | 46 | 56 |
| Fulfillment Costs | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Beginning of period balance | 47 | 47 | 46 | 46 |
| Cost Incurred | 12 | 9 | 21 | 19 |
| Amortization | (9) | (9) | (17) | (18) |
| Change in contract costs held for sale | (6) | (6) | ||
| End of period balance | 44 | $ 47 | 44 | $ 47 |
| Fulfillment Costs | Held-for-sale | Lumen Mass Markets fiber-to-the-home business | ||||
| Capitalized Contract Cost [Line Items] | ||||
| End of period balance | $ 6 | $ 6 | ||