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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Income [Abstract]        
Market data fees $ 9 $ 8 $ 18 $ 17
Account activity fees 5 5 10 9
Risk exposure fees 6 4 11 9
Payments for order flow 4 3 8 7
Gains on financial instruments, at fair value and other investments, net   16 2 51
Gains (losses) from currency diversification strategy, net 29 17 78 101
Other, net 6 4 8 7
Other income $ 59 $ 57 $ 135 $ 201