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Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 145 | $ 133 | $ 683
Provision for credit losses | 314 | 251 | 11
Write-offs | (363) | (313) | (593)
Recoveries collected | 38 | 39 | 32
Other | 18 | 13 | 0
Ending balance | 152 | 145 | 133
Provision for credit losses (decrease) increase due finance hedge risk |  | (70) |
Vivint Smart Home |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Acquired balance | $ 0 | $ 22 | $ 0

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