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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes $ 4,519 $ 7,398
Total financial instruments owned, at fair value 3,154 4,037
Total Financial Assets at Fair Value 7,673 11,435
Financial instruments sold, not yet purchased, at fair value 767 2,145
Total Financial Liabilities at Fair Value 767 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 2,001 1,821
Financial instruments sold, not yet purchased, at fair value 302 839
Options owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 1,052 1,804
Financial instruments sold, not yet purchased, at fair value 464 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 5 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 60 363
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 4 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 32 3
Financial instruments sold, not yet purchased, at fair value 1 19
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities segregated for regulatory purposes 4,519 7,398
Total financial instruments owned, at fair value 3,117 4,031
Total Financial Assets at Fair Value 7,636 11,429
Financial instruments sold, not yet purchased, at fair value 766 2,126
Total Financial Liabilities at Fair Value 766 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 2,000 1,821
Financial instruments sold, not yet purchased, at fair value 302 839
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 1,052 1,804
Financial instruments sold, not yet purchased, at fair value 464 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 5 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 60 363
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 33 5
Total Financial Assets at Fair Value 33 5
Financial instruments sold, not yet purchased, at fair value 1 19
Total Financial Liabilities at Fair Value 1 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 1 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 32 3
Financial instruments sold, not yet purchased, at fair value 1 19
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 4 1
Total Financial Assets at Fair Value 4 1
Level 3 | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial instruments owned, at fair value 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 $ 3 $ 1