Transactions with Affiliated Funds - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Mar. 31, 2020 |
|
| Transactions With Affiliated Funds [Abstract] | ||||
| Management fees waived | $ 109 | $ 44 | $ 51 | |
| Outstanding guarantees on behalf of certain nonconsolidated investment funds | 87 | $ 87 | ||
| Fair value of certificates of deposit and commercial paper purchased | $ 321 | $ 1,840 | ||