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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