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Accumulated Other Comprehensive Income - Narrative (Details) $ in Billions	Sep. 30, 2025 USD ($)
Equity [Abstract]
Remaining unamortized loss on securities transferred to held to maturity, net of tax	$ 8.5
Remaining unamortized loss on securities transferred to held to maturity, pretax	$ 11.1

X

- Definition

Debt Securities, Held-To Maturity, Transferred, Accumulated Unrecognized Loss, Before Tax

+ References

No definition available.

+ Details

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

X

- Definition

Debt Securities, Held-To Maturity, Transferred, Accumulated Unrecognized Loss, Net Of Tax

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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