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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 2,115 | $ 1,925 | $ 1,443 | $ 1,601
Cash and securities segregated for regulatory purposes | 24,187 | 24,017 |  |
Securities borrowed | 3,895 | 3,629 |  |
Securities purchased under agreements to resell | 366 | 111 |  |
Receivables from customer | 22,833 | 19,409 |  |
Receivables from brokers, dealers and clearing organizations | 1,164 | 1,040 |  |
Interest receivable | 59 | 57 |  |
Other assets | 405 | 448 |  |
Short-term borrowings | 9 | 74 |  |
Securities loaned | 3,632 | 4,293 |  |
Payables to customers | 45,950 | 41,731 |  |
Payables to brokers, dealers and clearing organizations | 449 | 239 |  |
Interest payable | 14 | 6 |  |
at Fair Value |  |  |  |
Cash and cash equivalents | 2,115 | 1,925 |  |
Cash and securities segregated for regulatory purposes | 20,684 | 16,619 |  |
Securities borrowed | 3,895 | 3,629 |  |
Securities purchased under agreements to resell | 366 | 111 |  |
Receivables from customer | 22,833 | 19,409 |  |
Receivables from brokers, dealers and clearing organizations | 1,164 | 1,040 |  |
Interest receivable | 59 | 57 |  |
Other assets | 12 | 32 |  |
Total financial assets, not measured at fair value | 51,128 | 42,822 |  |
Short-term borrowings | 9 | 74 |  |
Securities loaned | 3,632 | 4,293 |  |
Payables to customers | 45,950 | 41,731 |  |
Payables to brokers, dealers and clearing organizations | 449 | 239 |  |
Interest payable | 14 | 6 |  |
Total financial liabilities, not measured at fair value | 50,054 | 46,343 |  |
Carrying Value |  |  |  |
Cash and cash equivalents | 2,115 | 1,925 |  |
Cash and securities segregated for regulatory purposes | 20,684 | 16,619 |  |
Securities borrowed | 3,895 | 3,629 |  |
Securities purchased under agreements to resell | 366 | 111 |  |
Receivables from customer | 22,833 | 19,409 |  |
Receivables from brokers, dealers and clearing organizations | 1,164 | 1,040 |  |
Interest receivable | 59 | 57 |  |
Other assets | 8 | 28 |  |
Total financial assets, not measured at fair value | 51,124 | 42,818 |  |
Short-term borrowings | 9 | 74 |  |
Securities loaned | 3,632 | 4,293 |  |
Payables to customers | 45,950 | 41,731 |  |
Payables to brokers, dealers and clearing organizations | 449 | 239 |  |
Interest payable | 14 | 6 |  |
Total financial liabilities, not measured at fair value | 50,054 | 46,343 |  |
Level 1 |  |  |  |
Cash and cash equivalents | 2,115 | 1,925 |  |
Cash and securities segregated for regulatory purposes | 6,910 | 5,624 |  |
Total financial assets, not measured at fair value | 9,025 | 7,549 |  |
Short-term borrowings |  |  |  |
Securities loaned |  |  |  |
Payables to customers |  |  |  |
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 | 13,774 | 10,995 |  |
Securities borrowed | 3,895 | 3,629 |  |
Securities purchased under agreements to resell | 366 | 111 |  |
Receivables from customer | 22,833 | 19,409 |  |
Receivables from brokers, dealers and clearing organizations | 1,164 | 1,040 |  |
Interest receivable | 59 | 57 |  |
Other assets | 11 | 32 |  |
Total financial assets, not measured at fair value | 42,102 | 35,273 |  |
Short-term borrowings | 9 | 74 |  |
Securities loaned | 3,632 | 4,293 |  |
Payables to customers | 45,950 | 41,731 |  |
Payables to brokers, dealers and clearing organizations | 449 | 239 |  |
Interest payable | 14 | 6 |  |
Total financial liabilities, not measured at fair value | 50,054 | 46,343 |  |
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 | 1 |  |  |
Total financial assets, not measured at fair value | 1 |  |  |
Short-term borrowings |  |  |  |
Securities loaned |  |  |  |
Payables to customers |  |  |  |
Payables to brokers, dealers and clearing organizations |  |  |  |
Interest payable |  |  |  |
Total financial liabilities, not measured at fair value |  |  |  |

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