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Financial Instruments Subject to Off-Balance Sheet Credit Risk or Concentration Risk (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
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 $ 22,400 $ 20,400  
Fair value of client securities pledged in securities lending transactions to other broker-dealers 2,233 1,477  
Fair value of borrowed securities from other broker-dealers to fulfill short sales by clients 198 187  
Margin loans to brokerage clients 15,800 14,300  
Commitments to extend credit 7,400 6,700  
Fair value of mortgage-backed securities $ 72,300 $ 53,800  
Percentage of collateral to related assets 102.00% 102.00%  
U.S. agency mortgage-backed securities [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Fair value of mortgage-backed securities $ 71,000 $ 52,500  
Non-agency mortgage-backed securities [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Fair value of mortgage-backed securities $ 1,300 $ 1,300  
California [Member] | Client Accounts [Member] | Geographic Concentration Risk [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Concentration risk percentage 23.00% 23.00% 23.00%
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 $ 8,200 $ 10,400  
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 1,900 1,300  
Fair value of borrowed securities from other broker-dealers to fulfill short sales by clients 72 88  
Client Short Sales [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Fair value of Schwab's client securities pledged to fulfill the short sales 1,300 1,500  
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 303 216  
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 1,500 1,300  
Corporate Debt Securities And Commercial Paper [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Fair value of AFS securities, cash & cash equivalents, and other securities owned 11,100 8,100  
Adjustable Rate First Mortgages [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Residential real estate mortgage loans $ 7,500 $ 7,400  
Percent of residential real estate mortgage loans with interest only payment terms 39.00%    
Percent of interest-only residential real estate mortgage loans with interest rates not scheduled to reset for three or more years 53.00%    
Adjustable Rate First Mortgages [Member] | Minimum [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Interest-only loans period 3 years