Other Income (Schedule Of Components Of Other Income) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Other Income [Abstract] | ||
| Payments for order flow | $ 4 | $ 4 |
| Market data fees | 9 | 7 |
| Account activity fees | 4 | 4 |
| Risk exposure fees | 5 | 4 |
| Gains (losses) on financial instruments, at fair value and other investments, net | 35 | 32 |
| Gains (losses) from currency diversification strategy, net | 84 | (187) |
| Other, net | 3 | 4 |
| Other income (loss) | $ 144 | $ (132) |