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Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Financial Conditions) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 3,753 | $ 3,436 | $ 2,395 |
Total assets | 128,423 | 115,143 |  |
Liabilities and stockholders' equity |  |  |  |
Accrued expenses and other liabilities | 676 | 531 |  |
Total liabilities | 114,356 | 103,528 |  |
Stockholders’ equity: |  |  |  |
Additional paid-in capital | 1,726 | 1,581 |  |
Retained earnings | 1,852 | 1,294 |  |
Accumulated other comprehensive income, net of income taxes of $0 and $0 as of December 31, 2023 and 2022 | 8 | (22) |  |
Treasury stock, at cost, 133,034 and 169,420 shares as of December 31, 2023 and 2022 | (3) | (6) |  |
Total stockholders' equity | 3,584 | 2,848 |  |
Total liabilities and stockholders' equity | 128,423 | 115,143 |  |
Accumulated other comprehensive income tax | $ 0 | $ 0 |  |
Treasury stock shares | 133,034 | 169,420 |  |
Common Class A [Member] |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock, $0.01 par value per share | $ 1 | $ 1 |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |
Shares authorized | 1,000,000,000 | 1,000,000,000 |  |
Common stock, shares issued | 107,178,928 | 103,057,148 |  |
Common stock, shares outstanding | 107,045,894 | 102,887,728 |  |
Common Class B [Member] |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock, $0.01 par value per share |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |
Shares authorized | 100 | 100 |  |
Common stock, shares issued | 100 | 100 |  |
Common stock, shares outstanding | 100 | 100 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | $ 6 | $ 1 |  | $ 4
Investments in subsidiaries, equity basis | 3,571 | 2,845 |  |
Other assets | 230 | 231 |  |
Total assets | 3,807 | 3,077 |  |
Liabilities and stockholders' equity |  |  |  |
Payable to affiliates | 209 | 214 |  |
Accrued expenses and other liabilities | 14 | 15 |  |
Total liabilities | 223 | 229 |  |
Stockholders’ equity: |  |  |  |
Additional paid-in capital | 1,726 | 1,581 |  |
Retained earnings | 1,852 | 1,294 |  |
Accumulated other comprehensive income, net of income taxes of $0 and $0 as of December 31, 2023 and 2022 | 8 | (22) |  |
Treasury stock, at cost, 133,034 and 169,420 shares as of December 31, 2023 and 2022 | (3) | (6) |  |
Total stockholders' equity | 3,584 | 2,848 |  |
Total liabilities and stockholders' equity | 3,807 | 3,077 |  |
Accumulated other comprehensive income tax | $ 0 | $ 0 |  |
Treasury stock shares | 133,034 | 169,420 |  |
Parent Company [Member] | Common Class A [Member] |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock, $0.01 par value per share | $ 1 | $ 1 |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |
Shares authorized | 1,000,000,000 | 1,000,000,000 |  |
Common stock, shares issued | 107,178,928 | 103,057,148 |  |
Common stock, shares outstanding | 107,045,994 | 102,887,728 |  |
Parent Company [Member] | Common Class B [Member] |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock, $0.01 par value per share |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |
Shares authorized | 100 | 100 |  |
Common stock, shares issued | 100 | 100 |  |
Common stock, shares outstanding | 100 | 100 |  |

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