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Revenue Recognition - Governmental Funding (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 84 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2021
Government Assistance [Line Items] |  |  |  |  |  |
Government Assistance, Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | OPERATING REVENUE | OPERATING REVENUE |  |  |
Government funding |  | $ 83 | $ 85 |  |  |
State Universal Service Fund Support Programs |  |  |  |  |  |
Government Assistance [Line Items] |  |  |  |  |  |
Government assistance (as a percent) |  | 18.00% | 17.00% |  |  |
CAF II Program |  |  |  |  |  |
Government Assistance [Line Items] |  |  |  |  |  |
Government funding | $ 59 |  |  |  |  | $ 500
RDOF Phase I Program |  |  |  |  |  |
Government Assistance [Line Items] |  |  |  |  |  |
Government funding |  |  | $ 17 | $ 17 |  |
Allocated support payments |  | $ 16 |  |  | $ 6,400 |
Support payments period (in years) |  |  |  |  | 10 years |
Government funding receivable |  |  |  |  | $ 17 |
Government assistance, allocated support payment, each year thereafter |  | 15 |  |  |  |
Government assistance, liability |  | $ 10 |  |  |  |

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- Definition Amount of increase (decrease) in income from government assistance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483507/832-10-50-3 + Details
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