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Commitments and Contingencies - Commitments to Extend Credit on Lines of Credit and to Purchase First Mortgages (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 3,034 | $ 2,406
Commitments to extend credit related to unused HELOCs and other lines of credit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commitments to extend credit related to unused HELOCs and other lines of credit | 1,819 | 1,895
Residential real estate | First Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commitments to purchase First Mortgage loans | $ 1,215 | $ 511

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- Definition Financing Receivable, Commitments To Extend Credit And To Purchase + References No definition available. + Details
Name: | schw_FinancingReceivableCommitmentsToExtendCreditAndToPurchase
Namespace Prefix: | schw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financing Receivable, Commitments To Purchase + References No definition available. + Details
Name: | schw_FinancingReceivableCommitmentsToPurchase
Namespace Prefix: | schw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |