Fair Value Disclosures - Summary of Information Related to Bank Loans and Borrowings of Consolidated CLO Recorded within Investments and Borrowings of Consolidated VIEs Respectively for which Fair Value Option was Elected (Detail) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Fair Value Option Quantitative Disclosures [Line Items] | ||
| Aggregate principal amounts outstanding | $ 4,986 | |
| CLO Bank Loans [Member] | ||
| Fair Value Option Quantitative Disclosures [Line Items] | ||
| Aggregate principal amounts outstanding | 204 | $ 84 |
| Fair value | 204 | 84 |
| CLO Borrowings [Member] | ||
| Fair Value Option Quantitative Disclosures [Line Items] | ||
| Aggregate principal amounts outstanding | 195 | 84 |
| Fair value | $ 195 | $ 84 |