Commitments, Contingencies, And Guarantees (Narrative) (Detail) € in Millions, $ in Millions	Mar. 31, 2024 USD ($)	Mar. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Hedged Liability, Fair Value Hedge	$ 1,600	€ 1,500
Repurchase agreements	3,022		$ 2,833
Purchase Commitment, Remaining Minimum Amount Committed	1,000		1,000
Carrying value of limited partnerships and partially-owned investment companies included in other investments	14,000		13,900
Funding commitments relating to limited partnerships and partially-owned investment companies	5,900		6,200
Unrecognized tax benefits	73
Operating Lease, Right-of-Use Asset	762		784
Operating Lease, Liability	$ 818		$ 832
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 $14 and $33)	Other assets (includes VIE balances of $14 and $33)	Other assets (includes VIE balances of $14 and $33)
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 104		$ 115