| **Basis of Presentation (Details) $ in Millions**                  |        | 1 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------|--------|----------------|-----------------|
||
| Affiliated Entity | Liberty Media                                  |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Reimbursable expenses                                              |   |           | $ 9.7           | $ 8.3 |
| Gregory B. Maffei                                                  |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Employment term                                                    |   | 5 years        |            |   |
| Liberty Ventures | Series A Common Stock                           |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Shares redemption ratio                                            | 1      |           |            |   |
| Liberty Ventures | Series B Common Stock                           |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Shares redemption ratio                                            | 1      |           |            |   |
| Annual Based Salary | Gregory B. Maffei                            |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Related party costs                                                |   | $ 3.0          |            |   |
| One-Time Cash Commitment Bonus | Gregory B. Maffei                 |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Related party costs                                                |   | 5.0            |            |   |
| Aggregate Annual Target cash Performance Bonus | Gregory B. Maffei |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Related party costs                                                |   | 17.0           |            |   |
| Aggregate Annual Equity Awards | Gregory B. Maffei                 |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Related party costs                                                |   | 17.5           |            |   |
| Upfront Award | Gregory B. Maffei                                  |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Related party costs                                                |   | $ 90.0         |            |   |
| Gregory B. Maffei | Compensation | Affiliated Entity               |   |           |            |   |
| **Class of Stock [Line Items]**                                    |   |           |            |   |
| Expense allocation percent                                         |   | 14.00%         |            |   |

| X                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Employment term
+ References
No definition available.
+ Details**Name:**gliba_EmploymentTerm**Namespace Prefix:**gliba_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reimbursable Expenses, Due To Affiliate
+ References
No definition available.
+ Details**Name:**gliba_ReimbursableExpensesDueToAffiliate**Namespace Prefix:**gliba_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Related Party Transaction, Expenses From Transactions With Related Party, Allocation Percent
+ References
No definition available.
+ Details**Name:**gliba_RelatedPartyTransactionExpensesFromTransactionsWithRelatedPartyAllocationPercent**Namespace Prefix:**gliba_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Shares Redemption Ratio
+ References
No definition available.
+ Details**Name:**gliba_SharesRedemptionRatio**Namespace Prefix:**gliba_**Data Type:**xbrli:pureItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_ClassOfStockLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690
+ Details**Name:**us-gaap_RelatedPartyCosts**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**srt_CounterpartyNameAxis=gliba_LibertyMediaCorporationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_ChiefExecutiveOfficerMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_LegalEntityAxis=gliba_LibertyVenturesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionAxis=gliba_AnnualBasedSalaryMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionAxis=gliba_OneTimeCashCommitmentBonusMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionAxis=gliba_AggregateAnnualTargetcashPerformanceBonusMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionAxis=gliba_AggregateAnnualEquityAwardsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionAxis=gliba_UpfrontAwardMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionAxis=gliba_CompensationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |