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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Income [Abstract]      
Market data fees [1] $ 46 $ 39 $ 35
Risk exposure fees [1] 26 24 19
Payments for order flow [1] 21 15 14
Minimum activity fees [1] 23 20 18
Other brokerage related fees 25 13 10
Gains on financial instruments, at fair value and other investments, net 24 1 35
Gains (losses) from currency diversification strategy, net (19) 110 (40)
Other, net 12 110 3
Other income $ 158 $ 332 $ 94
[1] See Note 8 for description of these revenues.