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Financial Instruments Subject to Off-Balance Sheet Credit Risk or Concentration Risk (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of Schwab's client securities that can be pledged 20,400,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged $ 18,200,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged
Fair value of client securities pledged in securities lending transactions to other broker-dealers 1,477,000,000us-gaap_SecuritiesLoaned [1] 1,187,000,000us-gaap_SecuritiesLoaned [1]
Fair value of borrowed securities from other broker-dealers to fulfill short sales by clients 187,000,000us-gaap_SecuritiesBorrowed [2] 349,000,000us-gaap_SecuritiesBorrowed [2]
Fair value of Schwab's client securities pledged to fulfill the short sales 1,500,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged 1,600,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged
Contractual value of margin loans to clients 14,300,000,000us-gaap_MarginDepositAssets 12,800,000,000us-gaap_MarginDepositAssets
Commitments to purchase First Mortgage loans 226,000,000schw_CommitmentsToPurchaseFirstMortgageLoans 208,000,000schw_CommitmentsToPurchaseFirstMortgageLoans
Commitments to extend credit 6,700,000,000us-gaap_UnusedCommitmentsToExtendCredit 5,700,000,000us-gaap_UnusedCommitmentsToExtendCredit
Fair value of mortgage-backed securities 53,800,000,000schw_FairValueOfMortgageBackedSecurities 48,900,000,000schw_FairValueOfMortgageBackedSecurities
Securities available for sale 54,783,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities 51,618,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
Percent of residential real estate mortgage loans with interest only payment terms 40.00%schw_PercentOfResidentialRealEstateMortgageLoansWithInterestOnlyPaymentTerms  
Percent of interest-only residential real estate mortgage loans with interest rates not scheduled to reset for three or more years 65.00%schw_PercentOfInterestOnlyResidentialRealEstateMortgageLoansWithInterestRatesNotScheduledToResetForThreeOrMoreYears  
U.S. agency mortgage-backed securities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of mortgage-backed securities 52,500,000,000schw_FairValueOfMortgageBackedSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 47,100,000,000schw_FairValueOfMortgageBackedSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available for sale 18,717,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 [3] 18,645,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Non-agency mortgage-backed securities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of mortgage-backed securities 1,300,000,000schw_FairValueOfMortgageBackedSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		 1,800,000,000schw_FairValueOfMortgageBackedSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Asset-backed securities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Securities available for sale 19,366,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 15,206,000,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Resale And Repurchase Agreements [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of Schwab's client securities that can be pledged 10,400,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_ResaleAndRepurchaseAgreementsMember		 14,300,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_ResaleAndRepurchaseAgreementsMember
Securities Financing Transaction, Fair Value [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of client securities pledged in securities lending transactions to other broker-dealers 1,300,000,000us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionFairValueMember		 1,100,000,000us-gaap_SecuritiesLoaned
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionFairValueMember
Fair value of borrowed securities from other broker-dealers to fulfill short sales by clients 88,000,000us-gaap_SecuritiesBorrowed
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionFairValueMember		 276,000,000us-gaap_SecuritiesBorrowed
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_SecuritiesFinancingTransactionFairValueMember
Dividend Reinvestment Elections [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of Schwab's client securities pledged to fulfill the short sales 216,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_DividendReinvestmentElectionsMember		 130,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_DividendReinvestmentElectionsMember
Open Option Contracts [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of Schwab's client securities that can be pledged 1,300,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_OpenOptionContractsMember		 1,300,000,000us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_OpenOptionContractsMember
Corporate Debt Securities And Commercial Paper [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Investments in corporate debt securities and commercial paper 8,100,000,000us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_CorporateDebtSecuritiesAndCommercialPaperMember		 9,200,000,000us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned
/ us-gaap_SecuritiesFinancingTransactionAxis
= schw_CorporateDebtSecuritiesAndCommercialPaperMember
First Mortgage [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Residential real estate mortgage loans 7,400,000,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_FirstMortgageMember		 $ 7,300,000,000us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_SecuritiesFinancingTransactionAxis
= us-gaap_FirstMortgageMember
First Mortgage [Member] | Minimum [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Interest-only loans period 3 years  
[1] Included in payables to brokers, dealers, and clearing organizations in the Company’s consolidated balance sheets.
[2] Included in receivables from brokers, dealers, and clearing organizations in the Company’s consolidated balance sheets.
[3] Mortgage-backed securities have been allocated to maturity groupings based on final contractual maturities. Actual maturities will differ from final contractual maturities because borrowers on a certain portion of loans underlying these securities have the right to prepay their obligations.