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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Income [Abstract]      
Payments for order flow $ 14 $ 17 $ 25
Market data fees 35 30 24
Account activity fees 18 16 14
Risk exposure fees 19 21 6
Gains on financial instruments, at fair value and other investments, net 35 (18) (5)
Gains (losses) from currency diversification strategy, net (40) (206) (185)
Other, net 13 18 10
Other income $ 94 $ (122) $ (111)