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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Income [Abstract]      
Market data fees [1] $ 45 $ 46 $ 39
Risk exposure fees [1] 16 26 24
Payments for order flow [1] 21 21 15
Minimum activity fees [1] 27 23 20
Other brokerage related fees 27 25 13
Gains (losses) on financial instruments, at fair value and other investments, net 40 24 1
Gains (losses) from currency diversification strategy, net (60) (19) 110
Other, net 5 12 110
Other income $ 121 $ 158 $ 332
[1] See Note 8 for description of these revenues.