Bank Loans and Related Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 234	$ 223
Residential real estate \| First Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank loans	$ 27,000
Percent of loans with interest-only payments	23.00%
Percent of interest only adjustable rate	63.00%
Total bank loans	$ 31,269	30,484
Residential real estate \| First Mortgages \| Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed rate interest rate period	3 years
Adjusting rate interest rate period	6 months
Interest-only reset period	3 years
Residential real estate \| First Mortgages \| Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed rate interest rate period	10 years
Adjusting rate interest rate period	12 months
Residential real estate \| HELOCs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan term	30 years
Initial draw period	10 years
Converting to amortizing loans period	20 years
Total bank loans	$ 422	$ 427
Percent of loan balance outstanding, borrowers paid only minimum due	55.00%
Residential real estate \| Home Equity Secured By Second Liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total bank loans	$ 322

Adjustable Rate First Mortgages

No definition available.

Name:	schw_AdjustableRateFirstMortgages
Namespace Prefix:	schw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Convert To Amortizing Loans, Period

+ References

No definition available.

+ Details

Name:	schw_FinancingReceivableConvertToAmortizingLoansPeriod
Namespace Prefix:	schw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing Receivable, Initial Draw Period

+ References

No definition available.

+ Details

Name:	schw_FinancingReceivableInitialDrawPeriod
Namespace Prefix:	schw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing Receivable, Loan Term

+ References

No definition available.

+ Details

Name:	schw_FinancingReceivableLoanTerm
Namespace Prefix:	schw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing Receivable, Percent Of Loan Balance Outstanding, Borrowers Paid Only Minimum Due

+ References

No definition available.

+ Details

Name:	schw_FinancingReceivablePercentOfLoanBalanceOutstandingBorrowersPaidOnlyMinimumDue
Namespace Prefix:	schw_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Mortgage Loans On Real Estate, Adjusting Rate Interest Rate Period

+ References

No definition available.

+ Details

Name:	schw_MortgageLoansOnRealEstateAdjustingRateInterestRatePeriod
Namespace Prefix:	schw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Mortgage Loans On Real Estate, Fixed Rate Interest Rate Period

+ References

No definition available.

+ Details

Name:	schw_MortgageLoansOnRealEstateFixedRateInterestRatePeriod
Namespace Prefix:	schw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Mortgage Loans On Real Estate, Interest-Only Reset Period

+ References

No definition available.

+ Details

Name:	schw_MortgageLoansOnRealEstateInterestOnlyResetPeriod
Namespace Prefix:	schw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Mortgage Loans On Real Estate, Percent Of Interest Only Adjustable Rate

+ References

No definition available.

+ Details

Name:	schw_MortgageLoansOnRealEstatePercentOfInterestOnlyAdjustableRate
Namespace Prefix:	schw_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Mortgage Loans On Real Estate, Percent Of Loans With Interest-Only Payments

+ References

No definition available.

+ Details

Name:	schw_MortgageLoansOnRealEstatePercentOfLoansWithInterestOnlyPayments
Namespace Prefix:	schw_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

+ Details

Name:	us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FirstMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=schw_HomeEquitySecuredBySecondLiensMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: