Accumulated Other Comprehensive Income - Narrative (Details) $ in Billions	Sep. 30, 2023 USD ($)
Equity [Abstract]
Remaining unamortized loss on securities transferred to held to maturity, net of tax	$ 11.8
Remaining unamortized loss on securities transferred to held to maturity, pretax	$ 15.6

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

No definition available.

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