Fair Value Disclosures - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items | ||
| Collateralized loan obligations outstanding borrowings maturity year | 2030 | |
| Fair Value Option [Member] | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items | ||
| Total investments | $ 42 | $ 52 |