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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Other Income [Abstract]        
Payments for order flow $ 3 $ 4 $ 7 $ 8
Market data fees 8 6 17 13
Account activity fees 5 4 9 8
Risk exposure fees 4 7 9 11
Gains on financial instruments, at fair value and other investments, net 16 3 51 35
Gains (losses) from currency diversification strategy, net 17 25 101 (162)
Other, net 4 6 7 10
Other income $ 57 $ 55 $ 201 $ (77)