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v3.25.4

Summary of Significant Accounting Policies Cash Segregated Under Federal and Other Regulations (Details) | Dec. 31, 2025 USD ($)
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Accounting Policies [Abstract] |
Proprietary Account of Broker-Dealer under SEC Act Rule 15c-3-3 | $ 200,000

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- Definition Proprietary Account of Broker-Dealer under SEC Act Rule 15c-3-3 + References No definition available. + Details
Name: | lpla_ProprietaryAccountofBrokerDealerunderSECActRule15c33
Namespace Prefix: | lpla_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration