Commitments, Contingencies, And Guarantees (Narrative) (Detail) € in Millions, $ in Millions	Mar. 31, 2025 USD ($)	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Hedged Liability, Fair Value Hedge	$ 1,900	€ 1,700
Repurchase agreements	3,124		$ 2,731
Purchase Commitment, Remaining Minimum Amount Committed	1,200		1,300
Carrying value of limited partnerships and partially-owned investment companies included in other investments	15,300		14,500
Funding commitments relating to limited partnerships and partially-owned investment companies	6,400		6,400
Unrecognized tax benefits	97
Operating Lease, Right-of-Use Asset	1,052		824
Operating Lease, Liability	$ 1,177		$ 942
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities	Other liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets (includes VIE balances of $32 and $26)	Other assets (includes VIE balances of $32 and $26)	Other assets (includes VIE balances of $32 and $26)
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 223		$ 199