Transactions with Affiliated Funds - Fees Earned from Affiliated Funds (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Transactions With Affiliated Funds [Abstract] | |||
| Fees earned from funds | $ 3,393 | $ 2,967 | $ 3,571 |