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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other Income [Abstract]        
Payments for order flow $ 4 $ 5 $ 11 $ 13
Market data fees 9 8 26 21
Account activity fees 5 4 14 12
Risk exposure fees 5 6 14 17
Gains on financial instruments, at fair value and other investments, net (10) (4) 41 31
Gains (losses) from currency diversification strategy, net 11 (24) 112 (186)
Other, net 3 4 10 14
Other income $ 27 $ (1) $ 228 $ (78)