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Debt - Senior Notes and Senior Credit Facility (Details) - USD ($) $ in Millions | Jun. 12, 2023 | May 01, 2023 | Dec. 18, 2020 | Mar. 31, 2024 | Dec. 31, 2023 | Oct. 15, 2021
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  |  | $ 3,684 |  |
Fair value of debt |  |  |  | 1,200 | $ 1,255 |
Revolving Credit Facility | SOFR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate basis | SOFR |  |  |  |  |
Term Loan A | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 250
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fair value of debt |  |  |  | 551 |  |
Senior Notes | GCI Liberty Inc |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  | $ 600 |  |  |
Interest rate (as a percent) |  |  | 4.75% |  |  |
Aggregate unamortized premium |  |  |  | 22 |  |
Line of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  |  | 334 |  |
Line of credit | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount available for borrowing |  |  |  | 457 |  |
Line of credit | Minimum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.375% |  |  |  |  |
Line of credit | Maximum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.50% |  |  |  |  |
Line of credit | Revolving Credit Facility | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  |  | 90 |  |
Line of credit | Revolving Credit Facility | Alternate base rate | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate basis | alternate base rate |  |  |  |  |
Line of credit | Revolving Credit Facility | Alternate base rate | Minimum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |
Line of credit | Revolving Credit Facility | Alternate base rate | Maximum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |
Line of credit | Standby Letters of Credit | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  |  | 3 |  |
Line of credit | Term Loan A | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  |  | 244 |  |
Percentage of original principal amount | 0.25% |  |  |  |  |
Change in percentage of original principal amount | 1.25% |  |  |  |  |
Line of credit | Term Loan A | SOFR | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate basis | SOFR |  |  |  |  |
Line of credit | Term Loan A | SOFR | Minimum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |
Line of credit | Term Loan A | SOFR | Maximum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 3.25% |  |  |  |  |
Line of credit | Term Loan A | Alternate base rate | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate basis | alternate base rate |  |  |  |  |
Line of credit | Term Loan A | Alternate base rate | Minimum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |
Line of credit | Term Loan A | Alternate base rate | Maximum | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |
Senior Credit Facility | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
First lien leverage ratio | 4.00 |  |  |  |  |
Revolving Credit Facility | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | 550
Revolving Credit Facility | SOFR | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |
Revolving Credit Facility | SOFR | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 2.75% |  |  |  |  |
Standby Letters of Credit | GCI, LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 25
Wells Fargo Notes Payable | GCI Liberty Inc |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal |  |  |  | $ 5 | $ 5 |
Wells Fargo Notes Payable | SOFR | GCI Liberty Inc |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate basis |  | SOFR |  |  |  |
Basis spread on variable rate |  | 1.75% |  |  |  |
Wells Fargo Notes Payable | LIBOR | GCI Liberty Inc |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate basis |  |  | LIBOR |  |  |
Basis spread on variable rate |  |  | 2.25% |  |  |

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