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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 3,503 | $ 7,398
Total financial instruments owned, at fair value | 2,573 | 4,037
Total Financial Assets at Fair Value | 6,076 | 11,435
Financial instruments sold, not yet purchased, at fair value | 974 | 2,145
Total Financial Liabilities at Fair Value | 974 | 2,145
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,324 | 1,821
Financial instruments sold, not yet purchased, at fair value | 614 | 839
Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 973 | 1,804
Financial instruments sold, not yet purchased, at fair value | 355 | 1,286
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 | 3 | 43
Financial instruments sold, not yet purchased, at fair value |  | 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 | 245 | 363
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 | 25 | 3
Financial instruments sold, not yet purchased, at fair value | 5 | 19
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 3,503 | 7,398
Total financial instruments owned, at fair value | 2,545 | 4,031
Total Financial Assets at Fair Value | 6,048 | 11,429
Financial instruments sold, not yet purchased, at fair value | 969 | 2,126
Total Financial Liabilities at Fair Value | 969 | 2,126
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 | 1,324 | 1,821
Financial instruments sold, not yet purchased, at fair value | 614 | 839
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 | 973 | 1,804
Financial instruments sold, not yet purchased, at fair value | 355 | 1,286
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 | 3 | 43
Financial instruments sold, not yet purchased, at fair value |  | 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 | 245 | 363
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 27 | 5
Total Financial Assets at Fair Value | 27 | 5
Financial instruments sold, not yet purchased, at fair value | 5 | 19
Total Financial Liabilities at Fair Value | 5 | 19
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 | 2 | 2
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 | 25 | 3
Financial instruments sold, not yet purchased, at fair value | 5 | 19
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1 | 1
Total Financial Assets at Fair Value | 1 | 1
Level 3 | 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 | $ 1 | $ 1

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