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, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Fair Value Option Quantitative Disclosures [Line Items] | ||
| Aggregate principal amounts outstanding | $ 7,306 | |
| CLO Bank Loans [Member] | ||
| Fair Value Option Quantitative Disclosures [Line Items] | ||
| Aggregate principal amounts outstanding | 250 | $ 204 |
| Fair value | 248 | 204 |
| Aggregate unpaid principal balance in excess of (less than) fair value | 2 | |
| CLO Borrowings [Member] | ||
| Fair Value Option Quantitative Disclosures [Line Items] | ||
| Aggregate principal amounts outstanding | 244 | 195 |
| Fair value | $ 246 | $ 195 |