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Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
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