Goodwill, Spectrum License Transactions and Other Intangible Assets - Schedule of Spectrum Licenses (Details) - Licensing Agreements - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Indefinite-lived Intangible Assets [Roll Forward] | |||
| Spectrum licenses, beginning of year | $ 100,558 | $ 96,707 | $ 95,798 |
| Spectrum license acquisitions | 1,417 | 4,822 | 103 |
| Spectrum licenses acquired from the UScellular Acquisition | 1,730 | 0 | 0 |
| Spectrum licenses transferred to held for sale | (5,674) | (1,024) | (2) |
| Costs to clear spectrum | 1 | 53 | 808 |
| Spectrum licenses, end of year | $ 98,032 | $ 100,558 | $ 96,707 |