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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Cash and cash equivalents | $ 3,035 | $ 2,597 | $ 3,062
Cash - segregated for regulatory purposes | 8,794 | 7,503 | $ 7,523
Securities - segregated for regulatory purposes | 21,246 | 15,595 |
Securities borrowed | 4,010 | 3,331 |
Securities purchased under agreements to resell | 1,391 | 1,242 |
Receivables from customer | 25,970 | 27,017 |
Receivables from brokers, dealers and clearing organizations | 868 | 706 |
Interest Receivable | 131 | 141 |
Other assets | 476 | 296 |
Short-term borrowings | 15 | 17 |
Securities loaned | 3,955 | 4,037 |
Customers | 54,474 | 47,993 |
Brokers, dealers and clearing organizations | 245 | 298 |
Interest Payable | 37 | 41 |
at Fair Value |  |  |
Cash and cash equivalents | 3,035 | 2,597 |
Cash - segregated for regulatory purposes | 8,794 | 7,503 |
Securities - segregated for regulatory purposes | 17,459 | 11,382 |
Securities borrowed | 4,010 | 3,331 |
Securities purchased under agreements to resell | 1,391 | 1,242 |
Receivables from customer | 25,970 | 27,017 |
Receivables from brokers, dealers and clearing organizations | 868 | 706 |
Interest Receivable | 131 | 141 |
Other assets | 9 | 6 |
Total financial assets, not measured at fair value | 61,667 | 53,925 |
Short-term borrowings | 15 | 17 |
Securities loaned | 3,955 | 4,037 |
Customers | 54,474 | 47,993 |
Brokers, dealers and clearing organizations | 245 | 298 |
Interest Payable | 37 | 41 |
Total financial liabilities, not measured at fair value | 58,726 | 52,386 |
Carrying Value |  |  |
Cash and cash equivalents | 3,035 | 2,597 |
Cash - segregated for regulatory purposes | 8,794 | 7,503 |
Securities - segregated for regulatory purposes | 17,459 | 11,382 |
Securities borrowed | 4,010 | 3,331 |
Securities purchased under agreements to resell | 1,391 | 1,242 |
Receivables from customer | 25,970 | 27,017 |
Receivables from brokers, dealers and clearing organizations | 868 | 706 |
Interest Receivable | 131 | 141 |
Other assets | 9 | 5 |
Total financial assets, not measured at fair value | 61,667 | 53,924 |
Short-term borrowings | 15 | 17 |
Securities loaned | 3,955 | 4,037 |
Customers | 54,474 | 47,993 |
Brokers, dealers and clearing organizations | 245 | 298 |
Interest Payable | 37 | 41 |
Total financial liabilities, not measured at fair value | 58,726 | 52,386 |
Level 1 |  |  |
Cash and cash equivalents | 3,035 | 2,597 |
Cash - segregated for regulatory purposes | 8,794 | 7,503 |
Total financial assets, not measured at fair value | 11,829 | 10,100 |
Short-term borrowings |  |  |
Securities loaned |  |  |
Customers |  |  |
Brokers, dealers and clearing organizations |  |  |
Interest Payable |  |  |
Total financial liabilities, not measured at fair value |  |  |
Level 2 |  |  |
Securities - segregated for regulatory purposes | 17,459 | 11,382 |
Securities borrowed | 4,010 | 3,331 |
Securities purchased under agreements to resell | 1,391 | 1,242 |
Receivables from customer | 25,970 | 27,017 |
Receivables from brokers, dealers and clearing organizations | 868 | 706 |
Interest Receivable | 131 | 141 |
Other assets | 4 | 6 |
Total financial assets, not measured at fair value | 49,833 | 43,825 |
Short-term borrowings | 15 | 17 |
Securities loaned | 3,955 | 4,037 |
Customers | 54,474 | 47,993 |
Brokers, dealers and clearing organizations | 245 | 298 |
Interest Payable | 37 | 41 |
Total financial liabilities, not measured at fair value | 58,726 | 52,386 |
Level 3 |  |  |
Cash and cash equivalents |  |  |
Cash - segregated for regulatory purposes |  |  |
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 | 5 |  |
Total financial assets, not measured at fair value | 5 |  |
Short-term borrowings |  |  |
Securities loaned |  |  |
Customers |  |  |
Brokers, dealers and clearing organizations |  |  |
Interest Payable |  |  |
Total financial liabilities, not measured at fair value |  |  |

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