Fair Values of Assets and Liabilities (Fair Value Hierarchy for Assets Measured at Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014 |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | $ 611 | $ 516 |
Securities available for sale | 63,415 | 54,783 |
Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 1,175 | 2,174 |
Investments segregated and on deposit for regulatory purposes | 4,935 | 6,311 |
Other securities owned | 611 | 516 |
Securities available for sale | 63,415 | 54,783 |
Total | 70,136 | 63,784 |
Money market funds [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 758 | 2,142 |
Commercial paper [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 417 | 32 |
Certificates of deposit [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments segregated and on deposit for regulatory purposes | 3,077 | 4,125 |
Securities available for sale | 1,924 | 1,534 |
U.S. Government securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments segregated and on deposit for regulatory purposes | 1,858 | 2,186 |
Schwab Funds money market funds [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 248 | 224 |
Equity and bond mutual funds [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 292 | 215 |
State and municipal debt obligations [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 43 | 51 |
Equity, U.S. Government and corporate debt, and other securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 28 | 26 |
Asset-backed securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 21,670 | 19,366 |
U.S. agency mortgage-backed securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 20,825 | 18,717 |
Corporate debt securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 9,554 | 8,045 |
U.S. agency notes [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 5,291 | 3,795 |
Treasury securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 3,831 | 2,994 |
Non-agency commercial mortgage-backed securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 307 | 317 |
Other securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 13 | 15 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 758 | 2,142 |
Other securities owned | 542 | 441 |
Total | 1,300 | 2,583 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 758 | 2,142 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Schwab Funds money market funds [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 248 | 224 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity and bond mutual funds [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 292 | 215 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity, U.S. Government and corporate debt, and other securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 2 | 2 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 417 | 32 |
Investments segregated and on deposit for regulatory purposes | 4,935 | 6,311 |
Other securities owned | 69 | 75 |
Securities available for sale | 63,415 | 54,783 |
Total | 68,836 | 61,201 |
Significant Other Observable Inputs (Level 2) [Member] | Commercial paper [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 417 | 32 |
Significant Other Observable Inputs (Level 2) [Member] | Certificates of deposit [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments segregated and on deposit for regulatory purposes | 3,077 | 4,125 |
Securities available for sale | 1,924 | 1,534 |
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments segregated and on deposit for regulatory purposes | 1,858 | 2,186 |
Significant Other Observable Inputs (Level 2) [Member] | State and municipal debt obligations [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 43 | 51 |
Significant Other Observable Inputs (Level 2) [Member] | Equity, U.S. Government and corporate debt, and other securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Other securities owned | 26 | 24 |
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 21,670 | 19,366 |
Significant Other Observable Inputs (Level 2) [Member] | U.S. agency mortgage-backed securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 20,825 | 18,717 |
Significant Other Observable Inputs (Level 2) [Member] | Corporate debt securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 9,554 | 8,045 |
Significant Other Observable Inputs (Level 2) [Member] | U.S. agency notes [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 5,291 | 3,795 |
Significant Other Observable Inputs (Level 2) [Member] | Treasury securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 3,831 | 2,994 |
Significant Other Observable Inputs (Level 2) [Member] | Non-agency commercial mortgage-backed securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | 307 | 317 |
Significant Other Observable Inputs (Level 2) [Member] | Other securities [Member] | Fair Value [Member] | | |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities available for sale | $ 13 | $ 15 |