Goodwill, Spectrum License Transactions and Other Intangible Assets - Spectrum Licenses (Details) - Licensing Agreements - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Indefinite-lived Intangible Assets [Roll Forward] | |||
| Beginning balance | $ 82,828 | $ 36,465 | $ 35,559 |
| Spectrum license acquisitions | 9,545 | 1,023 | 857 |
| Spectrum licenses transferred to held for sale | 28 | 83 | 0 |
| Costs to clear spectrum | 261 | 23 | 49 |
| Ending balance | 92,606 | 82,828 | 36,465 |
| Sprint | |||
| Indefinite-lived Intangible Assets [Roll Forward] | |||
| Spectrum license acquisitions | $ 0 | $ 45,400 | $ 0 |