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Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value (Detail) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Assets  
Other securities owned$ 448$ 337
Securities available for sale28,96223,993
Fair Value, Measurements, Recurring
  
Assets  
Cash equivalents6831,230
Investments segregated and on deposit for regulatory purposes6,0667,095
Other securities owned448337
Securities available for sale28,96223,993
Total36,15932,655
Liabilities  
Securities sold, not yet purchased35[1] 
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
  
Assets  
Cash equivalents5988
Other securities owned358272
Total3631,260
Liabilities  
Securities sold, not yet purchased31[1] 
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
  
Assets  
Cash equivalents5988
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Schwab Funds money market funds
  
Assets  
Other securities owned131172
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity and bond mutual funds
  
Assets  
Other securities owned17699
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity, U.S. Government and corporate debt, and other securities
  
Assets  
Other securities owned511
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
  
Assets  
Cash equivalents678242
Investments segregated and on deposit for regulatory purposes6,0667,095
Other securities owned9065
Securities available for sale28,96223,993
Total35,79631,395
Liabilities  
Securities sold, not yet purchased4[1] 
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper
  
Assets  
Cash equivalents678242
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government securities
  
Assets  
Investments segregated and on deposit for regulatory purposes1,9503,190
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit
  
Assets  
Investments segregated and on deposit for regulatory purposes2,5892,201
Securities available for sale2,1011,875
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
  
Assets  
Investments segregated and on deposit for regulatory purposes1,5271,704
Securities available for sale3,0122,268
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | State and municipal debt obligations
  
Assets  
Other securities owned5947
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity, U.S. Government and corporate debt, and other securities
  
Assets  
Other securities owned3118
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency residential mortgage-backed securities
  
Assets  
Securities available for sale17,72413,098
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities
  
Assets  
Securities available for sale1,0341,470
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency notes
  
Assets  
Securities available for sale2,2682,780
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed and other securities
  
Assets  
Securities available for sale2,823 
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
  
Assets  
Securities available for sale 2,502
Fair Value, Measurements, Recurring | Money market funds
  
Assets  
Cash equivalents5988
Fair Value, Measurements, Recurring | Commercial paper
  
Assets  
Cash equivalents678242
Fair Value, Measurements, Recurring | U.S. Government securities
  
Assets  
Investments segregated and on deposit for regulatory purposes1,9503,190
Fair Value, Measurements, Recurring | Certificates of deposit
  
Assets  
Investments segregated and on deposit for regulatory purposes2,5892,201
Securities available for sale2,1011,875
Fair Value, Measurements, Recurring | Corporate debt securities
  
Assets  
Investments segregated and on deposit for regulatory purposes1,5271,704
Securities available for sale3,0122,268
Fair Value, Measurements, Recurring | Schwab Funds money market funds
  
Assets  
Other securities owned131172
Fair Value, Measurements, Recurring | Equity and bond mutual funds
  
Assets  
Other securities owned17699
Fair Value, Measurements, Recurring | State and municipal debt obligations
  
Assets  
Other securities owned5947
Fair Value, Measurements, Recurring | Equity, U.S. Government and corporate debt, and other securities
  
Assets  
Other securities owned8219
Fair Value, Measurements, Recurring | U.S. agency residential mortgage-backed securities
  
Assets  
Securities available for sale17,72413,098
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities
  
Assets  
Securities available for sale1,0341,470
Fair Value, Measurements, Recurring | U.S. agency notes
  
Assets  
Securities available for sale2,2682,780
Fair Value, Measurements, Recurring | Asset-backed and other securities
  
Assets  
Securities available for sale2,823 
Fair Value, Measurements, Recurring | Asset-backed securities
  
Assets  
Securities available for sale $ 2,502
[1]Securities sold, not yet purchased are included in accrued expenses and other liabilities.