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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 2,597 | $ 1,732 | $ 1,925 |
Total assets | 60,547 | 61,162 | $ 54,673 |
Liabilities and stockholders' equity |  |  |  |
Accrued expenses and other liabilities | 153 | 147 |  |
Total liabilities | 53,391 | 54,729 |  |
Stockholders’ equity: |  |  |  |
Additional paid-in capital | 898 | 832 |  |
Retained earnings | 390 | 251 |  |
Accumulated other comprehensive income, net of income taxes of $0 and $1 at December 31, 2015 and 2014 | (4) | 9 |  |
Treasury stock, at cost, 129,448 and 133,294 shares as of December 31, 2018 and December 31, 2017 | (3) | (3) |  |
Total stockholders' equity | 1,282 | 1,090 |  |
Total liabilities and stockholders' equity | $ 60,547 | $ 61,162 |  |
Treasury stock shares | 129,448 | 133,294 |  |
Common Class A |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock | $ 1 | $ 1 |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |
Shares authorized | 1,000,000,000 | 1,000,000,000 |  |
Common stock, shares issued | 75,230,400 | 71,609,049 |  |
Common stock, shares outstanding | 75,100,952 | 71,475,755 |  |
Common Class B |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock |  |  |  |
Shares authorized | 100 | 100 |  |
Common stock, shares issued | 100 | 100 |  |
Common stock, shares outstanding | 100 | 100 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | $ 1 |  |  | $ 1
Investments in subsidiaries, equity basis | 1,302 | $ 1,122 |  |
Other assets | 152 | 156 |  |
Total assets | 1,455 | 1,278 |  |
Liabilities and stockholders' equity |  |  |  |
Payable to affiliates | 171 | 187 |  |
Accrued expenses and other liabilities | 2 | 1 |  |
Total liabilities | 173 | 188 |  |
Stockholders’ equity: |  |  |  |
Additional paid-in capital | 898 | 832 |  |
Retained earnings | 390 | 251 |  |
Accumulated other comprehensive income, net of income taxes of $0 and $1 at December 31, 2015 and 2014 | (4) | 9 |  |
Treasury stock, at cost, 129,448 and 133,294 shares as of December 31, 2018 and December 31, 2017 | (3) | (3) |  |
Total stockholders' equity | 1,282 | 1,090 |  |
Total liabilities and stockholders' equity | 1,455 | 1,278 |  |
Parent Company [Member] | Common Class A |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock | 1 | 1 |  |
Parent Company [Member] | Common Class B |  |  |  |
Stockholders’ equity: |  |  |  |
Common stock |  |  |  |

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