Investments - Summary of Carrying Value of Total Investments (Detail) (Parenthetical) - USD ($) $ in Millions |
Mar. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Schedule of Investments [Line Items] | ||
| Trading debt securities | $ 1,132 | $ 1,186 |
| Equity securities | 1,769 | 1,738 |
| Consolidated Sponsored Investment Products [Member] | ||
| Schedule of Investments [Line Items] | ||
| Trading debt securities | 1,093 | 1,140 |
| Equity securities | $ 1,592 | $ 1,485 |