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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Income [Abstract]    
Market data fees [1] $ 11 $ 9
Minimum activity fees [1] 5 5
Risk exposure fees [1] 8 5
Payments for order flow [1] 5 4
Gains (losses) on financial instruments, at fair value and other investments, net 2 2
Gains (losses) from currency diversification strategy, net 38 49
Other, net 8 2
Other income $ 77 $ 76
[1] See Note 8 for description of these revenues.