Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Oct. 06, 2022	Dec. 31, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]
Derivative liability subject to a master netting agreement	$ 98	$ 98		$ 123
Repurchase agreements	2,417	2,417		1,406
Purchase Commitment, Remaining Minimum Amount Committed	630	630		771
Carrying value of limited partnerships and partially-owned investment companies included in other investments	12,000	12,000		9,800
Funding commitments relating to limited partnerships and partially-owned investment companies	7,600	7,600		7,200
Unrecognized tax benefits	57	57
Operating Lease, Right-of-Use Asset	458	458		445
Operating Lease, Liability	$ 486	$ 486		$ 484
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	Other assets		Other assets
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,700	$ 2,700
Hedged Liability, Fair Value Hedge	1,500	1,500
Foreign Currency Transaction Gain (Loss), Realized		32
Subsequent Event [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 3,000
Fair Value Hedging
Financial Instruments Owned and Pledged as Collateral [Line Items]
OCI, before Reclassifications, Net of Tax, Attributable to Parent	94	94
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	32	32
Net Investment Hedging
Financial Instruments Owned and Pledged as Collateral [Line Items]
OCI, before Reclassifications, Net of Tax, Attributable to Parent	$ 64	$ 64