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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Cash and cash equivalents | $ 3,292 | $ 2,882 | $ 3,035
Cash segregated for regulatory purposes | 12,789 | 9,400 | $ 8,794
Securities - segregated for regulatory purposes | 29,316 | 17,824 |
Securities borrowed | 3,995 | 3,916 |
Securities purchased under agreements to resell | 1,401 | 3,111 |
Receivables from customer | 30,343 | 31,304 |
Receivables from brokers, dealers and clearing organizations | 2,575 | 685 |
Interest Receivable | 69 | 158 |
Other assets | 466 | 480 |
Short-term borrowings | 628 | 16 |
Securities loaned | 5,738 | 4,410 |
Securities sold under agreements to repurchase |  | 1,909 |
Customers | 68,830 | 56,248 |
Brokers, dealers and clearing organizations | 313 | 220 |
Interest Payable | 3 | 29 |
at Fair Value |  |  |
Cash and cash equivalents | 3,292 | 2,882 |
Cash segregated for regulatory purposes | 12,789 | 9,400 |
Securities - segregated for regulatory purposes | 24,342 | 14,027 |
Securities borrowed | 3,995 | 3,916 |
Securities purchased under agreements to resell | 1,401 | 3,111 |
Receivables from customer | 30,343 | 31,304 |
Receivables from brokers, dealers and clearing organizations | 2,575 | 685 |
Interest Receivable | 69 | 158 |
Other assets | 11 | 9 |
Total financial assets, not measured at fair value | 78,817 | 65,492 |
Short-term borrowings | 628 | 16 |
Securities loaned | 5,738 | 4,410 |
Securities sold under agreements to repurchase |  | 1,909 |
Customers | 68,830 | 56,248 |
Brokers, dealers and clearing organizations | 313 | 220 |
Interest Payable | 3 | 29 |
Total financial liabilities, not measured at fair value | 75,512 | 62,832 |
Carrying Value |  |  |
Cash and cash equivalents | 3,292 | 2,882 |
Cash segregated for regulatory purposes | 12,789 | 9,400 |
Securities - segregated for regulatory purposes | 24,342 | 14,027 |
Securities borrowed | 3,995 | 3,916 |
Securities purchased under agreements to resell | 1,401 | 3,111 |
Receivables from customer | 30,343 | 31,304 |
Receivables from brokers, dealers and clearing organizations | 2,575 | 685 |
Interest Receivable | 69 | 158 |
Other assets | 11 | 9 |
Total financial assets, not measured at fair value | 78,817 | 65,492 |
Short-term borrowings | 628 | 16 |
Securities loaned | 5,738 | 4,410 |
Securities sold under agreements to repurchase |  | 1,909 |
Customers | 68,830 | 56,248 |
Brokers, dealers and clearing organizations | 313 | 220 |
Interest Payable | 3 | 29 |
Total financial liabilities, not measured at fair value | 75,512 | 62,832 |
Level 1 |  |  |
Cash and cash equivalents | 3,292 | 2,882 |
Cash segregated for regulatory purposes | 12,789 | 9,400 |
Total financial assets, not measured at fair value | 16,081 | 12,282 |
Short-term borrowings |  |  |
Securities loaned |  |  |
Securities sold under agreements to repurchase |  |  |
Customers |  |  |
Brokers, dealers and clearing organizations |  |  |
Interest Payable |  |  |
Total financial liabilities, not measured at fair value |  |  |
Level 2 |  |  |
Securities - segregated for regulatory purposes | 24,342 | 14,027 |
Securities borrowed | 3,995 | 3,916 |
Securities purchased under agreements to resell | 1,401 | 3,111 |
Receivables from customer | 30,343 | 31,304 |
Receivables from brokers, dealers and clearing organizations | 2,575 | 685 |
Interest Receivable | 69 | 158 |
Other assets | 2 | 3 |
Total financial assets, not measured at fair value | 62,727 | 53,204 |
Short-term borrowings | 628 | 16 |
Securities loaned | 5,738 | 4,410 |
Securities sold under agreements to repurchase |  | 1,909 |
Customers | 68,830 | 56,248 |
Brokers, dealers and clearing organizations | 313 | 220 |
Interest Payable | 3 | 29 |
Total financial liabilities, not measured at fair value | 75,512 | 62,832 |
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 customer |  |  |
Receivables from brokers, dealers and clearing organizations |  |  |
Interest Receivable |  |  |
Other assets | 9 | 6 |
Total financial assets, not measured at fair value | 9 | 6 |
Short-term borrowings |  |  |
Securities loaned |  |  |
Securities sold under agreements to repurchase |  |  |
Customers |  |  |
Brokers, dealers and clearing organizations |  |  |
Interest Payable |  |  |
Total financial liabilities, not measured at fair value |  |  |

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