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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income [Abstract]      
Market data fees $ 39 $ 35 $ 30
Account activity fees 20 18 16
Risk exposure fees 24 19 21
Payments for order flow 15 14 17
Gains (losses) on financial instruments, at fair value and other investments, net 1 35 (18)
Gains (losses) from currency diversification strategy, net 110 (40) (206)
Other, net 123 13 18
Other income $ 332 $ 94 $ (122)