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Summary of Significant Accounting Policies Cash Segregated Under Federal and Other Regulations (Details)	Dec. 31, 2025 USD ($)
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