Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Parenthetical) (Detail) - USD ($) $ in Millions |
Mar. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] | ||
| Total Unfunded Commitments | $ 680 | $ 665 |
| Real Assets Funds [Member] | ||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] | ||
| Total Unfunded Commitments | 355 | 346 |
| Total remaining Unfunded Commitments | $ 309 | $ 298 |