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Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | $ 2,356 | $ 1,215
Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 2,858 | 2,579
Hedge Funds/Funds of Hedge Funds/Other Member | Consolidated Variable Interest Entities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | $ 48 | $ 58
Redemption Frequency (Quarterly) | 89.00% | 64.00%
Redemption Frequency (Not Redeemable) | 11.00% | 36.00%
Hedge Funds/Funds of Hedge Funds/Other Member | Consolidated Variable Interest Entities [Member] | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 385 | $ 92
Private Equity Funds [Member] | Consolidated Variable Interest Entities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | 34 | 42
Private Equity Funds [Member] | Consolidated Variable Interest Entities [Member] | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 181 | 7
Real Assets Funds Member |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | 1,900 | 750
Real Assets Funds Member | Consolidated Variable Interest Entities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | 29 | 40
Real Assets Funds Member | Consolidated Variable Interest Entities [Member] | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 372 | $ 175
Other Funds [Member] | Consolidated Variable Interest Entities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period, days |  | 90 days
Other Funds [Member] | Minimum [Member] | Consolidated Variable Interest Entities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period, days | 60 days |
Other Funds [Member] | Maximum [Member] | Consolidated Variable Interest Entities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period, days | 90 days |
Equity Method Investments [Member] | Hedge Funds/Funds of Hedge Funds/Other Member |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | $ 150 | $ 138
Redemption Frequency (Daily) |  | 2.00%
Redemption Frequency (Monthly) |  | 2.00%
Redemption Frequency (Quarterly) | 12.00% | 10.00%
Redemption Frequency (Not Redeemable) | 88.00% | 88.00%
Equity Method Investments [Member] | Hedge Funds/Funds of Hedge Funds/Other Member | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 446 | $ 552
Equity Method Investments [Member] | Hedge Funds/Funds of Hedge Funds/Other Member | Minimum [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period, days | 1 day | 1 day
Equity Method Investments [Member] | Hedge Funds/Funds of Hedge Funds/Other Member | Maximum [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period, days | 90 days | 90 days
Equity Method Investments [Member] | Private Equity Funds [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | $ 225 | $ 227
Equity Method Investments [Member] | Private Equity Funds [Member] | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 510 | 1,060
Equity Method Investments [Member] | Real Assets Funds Member |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | $ 1,870 | $ 710
Redemption Frequency (Quarterly) | 7.00% | 7.00%
Redemption Frequency (Not Redeemable) | 93.00% | 93.00%
Redemption Notice Period, days | 60 days | 60 days
Equity Method Investments [Member] | Real Assets Funds Member | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 524 | $ 520
Equity Method Investments [Member] | Investments Related To Deferred Cash Compensation Plans Member |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | 0 | 0
Equity Method Investments [Member] | Investments Related To Deferred Cash Compensation Plans Member | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 300 | $ 173
Equity Method Investments [Member] | Investments Related To Deferred Cash Compensation Plans Member | Minimum [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period, days | 1 day | 1 day
Equity Method Investments [Member] | Investments Related To Deferred Cash Compensation Plans Member | Maximum [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period, days | 90 days | 90 days
Other Investments [Member] | Private Credit Fund [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total Unfunded Commitments | $ 0 |
Redemption Notice Period, days | 30 days |
Other Investments [Member] | Private Credit Fund [Member] | Fair Value Measured at NAV per share [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 140 |

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