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Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 23, 2021 | Feb. 28, 2021 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2024
Business Acquisition [Line Items] |  |  |  |  |
Payments for deposits |  |  | $ 449 | $ 598 |
Spectrum licenses | Spectrum Licenses, C-Band |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated clearing and incentive costs |  | $ 7,600 |  |  |
Spectrum licenses | Spectrum Licenses, C-Band | Scenario, Forecast |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated clearing and incentive costs |  |  |  |  | $ 100
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments for deposits |  |  | 269 | 114 |
TracFone Wireless, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price in cash | $ 3,500 |  |  |  |
Number of shares issuable (in shares) | 57,596,544 |  |  |  |
Business combination, consideration transferred, equity interests issued and issuable | $ 3,000 |  |  |  |
Future cash consideration related to achievement of certain performance measures | 650 |  |  |  |
Contingent consideration | $ 560 |  |  |  |
Contingent consideration, earn out period | 2 years |  |  |  |
Contingent consideration payment |  |  | $ 52 | $ 102 |

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