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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 1,443 | $ 1,601 | $ 1,041 | $ 1,269
Cash and securities segregated for regulatory purposes | 25,257 | 21,309 |  |
Securities Borrowed | 3,760 | 3,924 |  |
Securities purchased under agreements to resell | 113 | 195 |  |
Receivables from customer | 15,137 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 1,351 | 692 |  |
Interest receivable | 58 | 63 |  |
Other Assets | 456 | 480 |  |
Short-term borrowings | 8 |  |  |
Securities Loaned | 3,270 | 2,894 |  |
Payables to customer | 39,319 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 286 | 423 |  |
Interest payable | 4 | 3 |  |
at Fair Value |  |  |  |
Cash and cash equivalents | 1,443 | 1,601 |  |
Cash and securities segregated for regulatory purposes | 10,504 | 6,095 |  |
Securities Borrowed | 3,760 | 3,924 |  |
Securities purchased under agreements to resell | 113 | 195 |  |
Receivables from customer | 15,137 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 1,351 | 692 |  |
Interest receivable | 58 | 63 |  |
Other Assets | 31 | 31 |  |
Total financial assets, not measured at fair value | 32,397 | 29,651 |  |
Short-term borrowings | 8 |  |  |
Securities Loaned | 3,270 | 2,894 |  |
Payables to customer | 39,319 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 286 | 423 |  |
Interest payable | 4 | 3 |  |
Total financial liabilities, not measured at fair value | 42,887 | 40,404 |  |
Carrying Value |  |  |  |
Cash and cash equivalents | 1,443 | 1,601 |  |
Cash and securities segregated for regulatory purposes | 10,504 | 6,095 |  |
Securities Borrowed | 3,760 | 3,924 |  |
Securities purchased under agreements to resell | 113 | 195 |  |
Receivables from customer | 15,137 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 1,351 | 692 |  |
Interest receivable | 58 | 63 |  |
Other Assets | 29 | 28 |  |
Total financial assets, not measured at fair value | 32,395 | 29,648 |  |
Short-term borrowings | 8 |  |  |
Securities Loaned | 3,270 | 2,894 |  |
Payables to customer | 39,319 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 286 | 423 |  |
Interest payable | 4 | 3 |  |
Total financial liabilities, not measured at fair value | 42,887 | 40,404 |  |
Level 1 |  |  |  |
Cash and cash equivalents | 1,443 | 1,601 |  |
Cash and securities segregated for regulatory purposes | 5,891 | 5,533 |  |
Total financial assets, not measured at fair value | 7,334 | 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 | 4,613 | 562 |  |
Securities Borrowed | 3,760 | 3,924 |  |
Securities purchased under agreements to resell | 113 | 195 |  |
Receivables from customer | 15,137 | 17,050 |  |
Receivables from brokers, dealers and clearing organizations | 1,351 | 692 |  |
Interest receivable | 58 | 63 |  |
Other Assets | 31 | 31 |  |
Total financial assets, not measured at fair value | 25,063 | 22,517 |  |
Short-term borrowings | 8 |  |  |
Securities Loaned | 3,270 | 2,894 |  |
Payables to customer | 39,319 | 37,084 |  |
Payables to brokers, dealers and clearing organizations | 286 | 423 |  |
Interest payable | 4 | 3 |  |
Total financial liabilities, not measured at fair value | 42,887 | 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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