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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 1,550 | $ 1,601 | $ 1,588 | $ 1,269
Cash and securities segregated for regulatory purposes | 25,250 | 21,309 |  |
Securities Borrowed | 4,785 | 3,924 |  |
Securities purchased under agreements to resell | 148 | 195 |  |
Receivables from customer | 18,223 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 764 | 692 |  |
Interest receivable | 66 | 63 |  |
Other Assets | 455 | 480 |  |
Short-term borrowings | 24 |  |  |
Securities Loaned | 3,617 | 2,894 |  |
Payables to customer | 42,486 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 210 | 423 |  |
Interest payable | 4 | 3 |  |
at Fair Value |  |  |  |
Cash and cash equivalents | 1,550 | 1,601 |  |
Cash and securities segregated for regulatory purposes | 13,187 | 6,095 |  |
Securities Borrowed | 4,785 | 3,924 |  |
Securities purchased under agreements to resell | 148 | 195 |  |
Receivables from customer | 18,223 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 764 | 692 |  |
Interest receivable | 66 | 63 |  |
Other Assets | 32 | 31 |  |
Total financial assets, not measured at fair value | 38,755 | 29,651 |  |
Short-term borrowings | 24 |  |  |
Securities Loaned | 3,617 | 2,894 |  |
Payables to customer | 42,486 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 210 | 423 |  |
Interest payable | 4 | 3 |  |
Total financial liabilities, not measured at fair value | 46,341 | 40,404 |  |
Carrying Value |  |  |  |
Cash and cash equivalents | 1,550 | 1,601 |  |
Cash and securities segregated for regulatory purposes | 13,187 | 6,095 |  |
Securities Borrowed | 4,785 | 3,924 |  |
Securities purchased under agreements to resell | 148 | 195 |  |
Receivables from customer | 18,223 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 764 | 692 |  |
Interest receivable | 66 | 63 |  |
Other Assets | 29 | 28 |  |
Total financial assets, not measured at fair value | 38,752 | 29,648 |  |
Short-term borrowings | 24 |  |  |
Securities Loaned | 3,617 | 2,894 |  |
Payables to customer | 42,486 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 210 | 423 |  |
Interest payable | 4 | 3 |  |
Total financial liabilities, not measured at fair value | 46,341 | 40,404 |  |
Level 1 |  |  |  |
Cash and cash equivalents | 1,550 | 1,601 |  |
Cash and securities segregated for regulatory purposes | 6,224 | 5,533 |  |
Total financial assets, not measured at fair value | 7,774 | 7,134 |  |
Short-term borrowings |  |  |  |
Securities Loaned |  |  |  |
Payables to customer |  |  |  |
Payables to brokers, dealers and clearing organizations |  |  |  |
Interest payable |  |  |  |
Total financial liabilities, not measured at fair value |  |  |  |
Level 2 |  |  |  |
Cash and securities segregated for regulatory purposes | 6,963 | 562 |  |
Securities Borrowed | 4,785 | 3,924 |  |
Securities purchased under agreements to resell | 148 | 195 |  |
Receivables from customer | 18,223 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 764 | 692 |  |
Interest receivable | 66 | 63 |  |
Other Assets | 32 | 31 |  |
Total financial assets, not measured at fair value | 30,981 | 22,517 |  |
Short-term borrowings | 24 |  |  |
Securities Loaned | 3,617 | 2,894 |  |
Payables to customer | 42,486 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 210 | 423 |  |
Interest payable | 4 | 3 |  |
Total financial liabilities, not measured at fair value | 46,341 | 40,404 |  |
Level 3 |  |  |  |
Cash and cash equivalents |  |  |  |
Cash and securities segregated for regulatory purposes |  |  |  |
Securities Borrowed |  |  |  |
Securities purchased under agreements to resell |  |  |  |
Receivables from customer |  |  |  |
Receivables from brokers, dealers and clearing organizations |  |  |  |
Interest receivable |  |  |  |
Other Assets |  |  |  |
Total financial assets, not measured at fair value |  |  |  |
Short-term borrowings |  |  |  |
Securities Loaned |  |  |  |
Payables to customer |  |  |  |
Payables to brokers, dealers and clearing organizations |  |  |  |
Interest payable |  |  |  |
Total financial liabilities, not measured at fair value |  |  |  |

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