Related Party Transactions - Revenue for Services Provided to Related Parties (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Related Party Transaction [Line Items] | |||
| Revenues from related parties | $ 9,403 | $ 8,522 | $ 8,412 |
| Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | |||
| Related Party Transaction [Line Items] | |||
| Revenues from related parties | 9,079 | 8,323 | 8,226 |
| Investment Advisory Performance Fees [Member] | |||
| Related Party Transaction [Line Items] | |||
| Revenues from related parties | 301 | 131 | 112 |
| Technology Services Revenue [Member] | |||
| Related Party Transaction [Line Items] | |||
| Revenues from related parties | 4 | 9 | 9 |
| Advisory and Other Revenue [Member] | |||
| Related Party Transaction [Line Items] | |||
| Revenues from related parties | $ 19 | $ 59 | $ 65 |