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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Income [Abstract]        
Market data fees [1] $ 11 $ 12 $ 34 $ 34
Risk exposure fees [1] 4 5 13 20
Payments for order flow [1] 5 6 16 16
Minimum activity fees [1] 7 6 20 16
Other brokerage related fees 7 7 19 18
Gains (losses) on financial instruments, at fair value and other investments, net (7) 4 49 15
Gains (losses) from currency diversification strategy, net (47) (24) (72) (7)
Other, net 1 5 4 9
Other income $ (19) $ 21 $ 83 $ 121
[1] See Note 8 for description of these revenues.