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Securities Available for Sale and Securities Held to Maturity (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Fair value of pledged securities $ 132us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral     $ 132us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Fair Isaac & Company minimum credit score for Prime loan origination 620schw_MinimumCreditScorePrimeLoans     620schw_MinimumCreditScorePrimeLoans
Net impairment losses on securities 1.0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1] 10.0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1] 32.0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet [1]  
Securities available for sale 54,783us-gaap_AvailableForSaleSecuritiesDebtSecurities 51,618us-gaap_AvailableForSaleSecuritiesDebtSecurities   54,783us-gaap_AvailableForSaleSecuritiesDebtSecurities
Non-agency residential mortgage-backed securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Net impairment losses on securities       0.6us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= schw_ResidentialMortageBackedSecuritiesIssuedByPrivateEnterprisesMember
Proceeds from sale of available for sale securities       504us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= schw_ResidentialMortageBackedSecuritiesIssuedByPrivateEnterprisesMember
Net realized loss       8us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= schw_ResidentialMortageBackedSecuritiesIssuedByPrivateEnterprisesMember
Securities available for sale   593us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= schw_ResidentialMortageBackedSecuritiesIssuedByPrivateEnterprisesMember		    
Other securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Securities available for sale $ 15us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		 $ 100us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember		   $ 15us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
[1] Net impairment losses on securities include total other-than-temporary impairment losses of $1 million, $2 million, and $15 million recognized in other comprehensive income, net of less than $1 million, $(8) million, and $(17) million reclassified from other comprehensive income in 2014, 2013, and 2012, respectively.