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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Cash and cash equivalents | $ 2,838 | $ 4,292 | $ 3,292
Cash segregated for regulatory purposes | 23,125 | 15,903 | $ 12,789
Securities - segregated for regulatory purposes | 14,400 | 27,821 |
Securities borrowed | 3,811 | 4,956 |
Securities purchased under agreements to resell | 6,108 | 792 |
Receivables from customers | 50,503 | 39,333 |
Receivables from brokers, dealers and clearing organizations | 4,038 | 1,254 |
Interest Receivable | 113 | 104 |
Other assets | 687 | 594 |
Short-term borrowings | 28 | 118 |
Securities loaned | 10,535 | 9,838 |
Payable to customers | 84,087 | 75,882 |
Brokers, dealers and clearing organizations | 781 | 182 |
Interest Payable | 10 | 6 |
at Fair Value |  |  |
Cash and cash equivalents | 2,838 | 4,292 |
Cash segregated for regulatory purposes | 23,125 | 15,903 |
Securities - segregated for regulatory purposes | 10,475 | 23,071 |
Securities borrowed | 3,811 | 4,956 |
Securities purchased under agreements to resell | 6,108 | 792 |
Receivables from customers | 50,503 | 39,333 |
Receivables from brokers, dealers and clearing organizations | 4,038 | 1,254 |
Interest Receivable | 113 | 104 |
Other assets | 19 | 13 |
Total financial assets, not measured at fair value | 101,030 | 89,718 |
Short-term borrowings | 28 | 118 |
Securities loaned | 10,535 | 9,838 |
Payable to customers | 84,087 | 75,882 |
Brokers, dealers and clearing organizations | 781 | 182 |
Interest Payable | 10 | 6 |
Total financial liabilities, not measured at fair value | 95,441 | 86,026 |
Carrying Value |  |  |
Cash and cash equivalents | 2,838 | 4,292 |
Cash segregated for regulatory purposes | 23,125 | 15,903 |
Securities - segregated for regulatory purposes | 10,475 | 23,071 |
Securities borrowed | 3,811 | 4,956 |
Securities purchased under agreements to resell | 6,108 | 792 |
Receivables from customers | 50,503 | 39,333 |
Receivables from brokers, dealers and clearing organizations | 4,038 | 1,254 |
Interest Receivable | 113 | 104 |
Other assets | 19 | 13 |
Total financial assets, not measured at fair value | 101,030 | 89,718 |
Short-term borrowings | 28 | 118 |
Securities loaned | 10,535 | 9,838 |
Payable to customers | 84,087 | 75,882 |
Brokers, dealers and clearing organizations | 781 | 182 |
Interest Payable | 10 | 6 |
Total financial liabilities, not measured at fair value | 95,441 | 86,026 |
Level 1 [Member] |  |  |
Cash and cash equivalents | 2,838 | 4,292 |
Cash segregated for regulatory purposes | 23,125 | 15,903 |
Total financial assets, not measured at fair value | 25,963 | 20,195 |
Short-term borrowings |  |  |
Securities loaned |  |  |
Payable to customers |  |  |
Brokers, dealers and clearing organizations |  |  |
Interest Payable |  |  |
Total financial liabilities, not measured at fair value |  |  |
Level 2 [Member] |  |  |
Securities - segregated for regulatory purposes | 10,475 | 23,071 |
Securities borrowed | 3,811 | 4,956 |
Securities purchased under agreements to resell | 6,108 | 792 |
Receivables from customers | 50,503 | 39,333 |
Receivables from brokers, dealers and clearing organizations | 4,038 | 1,254 |
Interest Receivable | 113 | 104 |
Other assets | 2 | 2 |
Total financial assets, not measured at fair value | 75,050 | 69,512 |
Short-term borrowings | 28 | 118 |
Securities loaned | 10,535 | 9,838 |
Payable to customers | 84,087 | 75,882 |
Brokers, dealers and clearing organizations | 781 | 182 |
Interest Payable | 10 | 6 |
Total financial liabilities, not measured at fair value | 95,441 | 86,026 |
Level 3 [Member] |  |  |
Cash and cash equivalents |  |  |
Cash segregated for regulatory purposes |  |  |
Securities - segregated for regulatory purposes |  |  |
Securities borrowed |  |  |
Securities purchased under agreements to resell |  |  |
Receivables from customers |  |  |
Receivables from brokers, dealers and clearing organizations |  |  |
Interest Receivable |  |  |
Other assets | 17 | 11 |
Total financial assets, not measured at fair value | 17 | 11 |
Short-term borrowings |  |  |
Securities loaned |  |  |
Payable to customers |  |  |
Brokers, dealers and clearing organizations |  |  |
Interest Payable |  |  |
Total financial liabilities, not measured at fair value |  |  |

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