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Organization and Description of the Company (Details)	12 Months Ended
	Dec. 31, 2025
LPL Financial [Member]
Consolidation, Parent Ownership Interest [Line Items]
Ownership interest percentage in subsidiary	100.00%
Number of states in which entity operates	50
AW Subsidiary Inc. [Member]
Consolidation, Parent Ownership Interest [Line Items]
Ownership interest percentage in subsidiary	100.00%
LPL Employee Services, LLC [Member]
Consolidation, Parent Ownership Interest [Line Items]
Ownership interest percentage in subsidiary	100.00%
Fortigent [Member]
Consolidation, Parent Ownership Interest [Line Items]
Ownership interest percentage in subsidiary	100.00%
LPLIA [Member]
Consolidation, Parent Ownership Interest [Line Items]
Ownership interest percentage in subsidiary	100.00%
Captive Insurance Subsidiary [Member]
Consolidation, Parent Ownership Interest [Line Items]
Ownership interest percentage in subsidiary	100.00%

X

- Definition

Ownership interest percentage in subsidiary.

+ References

No definition available.

+ Details

Name:	lpla_OwnershipInterestPercentageInSubsidiary
Namespace Prefix:	lpla_
Data Type:	dtr-types1:percentItemType
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_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=lpla_LPLFinancialLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lpla_AWSubsidiaryIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lpla_LPLEmployeeServicesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lpla_FortigentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lpla_LplInsuranceAssociateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lpla_CaptiveInsuranceSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: