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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Income [Abstract]        
Market data fees [1] $ 11 $ 9 $ 22 $ 18
Minimum activity fees [1] 5 5 10 10
Risk exposure fees [1] 7 6 15 11
Payments for order flow [1] 5 4 10 8
Gains (losses) on financial instruments, at fair value and other investments, net 9   11 2
Gains (losses) from currency diversification strategy, net (21) 29 17 78
Other, net 7 6 15 8
Other income $ 23 $ 59 $ 100 $ 135
[1] See Note 8 for description of these revenues.