Commitments and Contingencies - Additional Information (Detail) $ in Millions |
Mar. 31, 2022
USD ($)
|
|---|---|
| Commitments And Contingencies Disclosure [Abstract] | |
| Investment commitments | $ 844 |
| Amount of securities on loan subject to indemnification | 287,000 |
| Collateral for indemnified securities | $ 307,000 |