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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 14,753 | $ 15,214
Total financial instruments owned, at fair value | 4,254 | 3,420
Total Financial Assets at Fair Value | 19,007 | 18,634
Financial instruments sold, not yet purchased, at fair value | 2,874 | 2,617
Total Financial Liabilities at Fair Value | 2,874 | 2,617
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,943 | 1,650
Financial instruments sold, not yet purchased, at fair value | 1,567 | 1,565
Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,742 | 1,156
Financial instruments sold, not yet purchased, at fair value | 1,296 | 1,042
Warrants And Discount Certificates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 52 | 81
Financial instruments sold, not yet purchased, at fair value | 2 | 1
U.S. And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 490 | 527
Corporate And Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 3 | 3
Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 24 | 3
Financial instruments sold, not yet purchased, at fair value | 9 | 9
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 14,753 | 15,214
Total financial instruments owned, at fair value | 4,227 | 3,414
Total Financial Assets at Fair Value | 18,980 | 18,628
Financial instruments sold, not yet purchased, at fair value | 2,865 | 2,608
Total Financial Liabilities at Fair Value | 2,865 | 2,608
Level 1 | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,943 | 1,650
Financial instruments sold, not yet purchased, at fair value | 1,567 | 1,565
Level 1 | Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,742 | 1,156
Financial instruments sold, not yet purchased, at fair value | 1,296 | 1,042
Level 1 | Warrants And Discount Certificates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 52 | 81
Financial instruments sold, not yet purchased, at fair value | 2 | 1
Level 1 | U.S. And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 490 | 527
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 27 | 6
Total Financial Assets at Fair Value | 27 | 6
Financial instruments sold, not yet purchased, at fair value | 9 | 9
Total Financial Liabilities at Fair Value | 9 | 9
Level 2 | Corporate And Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 3 | 3
Level 2 | Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 24 | 3
Financial instruments sold, not yet purchased, at fair value | $ 9 | $ 9

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