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Commitments and Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Aug. 28, 2008
Commitments and Contingencies Disclosure [Line Items]    
Amount of commitment qualified affordable housing project investments 37schw_QualifiedAffordableHousingProjectInvestmentsCommitment  
Amount of investment in qualified affordable housing projects 44schw_AmortizationMethodQualifiedAffordableHousingProjectInvestments  
Standby letters of credit [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Aggregate face amount of letter of credit agreements 240us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
 
Performance Guarantee [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Liability for guarantees 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PerformanceGuaranteeMember
 
Bond Market Fund Litigation [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Alleged minimum percentage of fund assets invested in CMOs and mortgage-backed securities without obtaining shareholder vote   25.00%schw_MinimumPercentageOfFundAssets
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= schw_BondMarketFundLitigationMember
Margin Requirements [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Funds drawn under LOC's 0us-gaap_LineOfCredit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= schw_MarginRequirementsMember
 
Minimum [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Commitment to investments in qualified affordable housing project, payment period 2015  
Maximum [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Commitment to investments in qualified affordable housing project, payment period 2020