Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Parenthetical) (Detail) - USD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share Line Items | ||
| Total Unfunded Commitments | $ 725 | $ 789 |
| Real Assets Funds Member | ||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share Line Items | ||
| Total Unfunded Commitments | 272 | 398 |
| Total remaining Unfunded Commitments | $ 248 | $ 364 |