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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Other Income [Abstract]    
Market data fees [1] $ 12 $ 11
Risk exposure fees [1] 4 8
Payments for order flow [1] 5 5
Minimum activity fees [1] 7 5
Other brokerage related fees 6 5
Gains on financial instruments, at fair value and other investments, net 116 2
Gains (losses) from currency diversification strategy, net (19) 38
Other, net 1 3
Other income $ 132 $ 77
[1] See Note 8 for description of these revenues.