Commitments, Contingencies, And Guarantees (Narrative) (Detail) € in Millions, ¥ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreements	$ 3,059			$ 2,731
Carrying value of limited partnerships and partially-owned investment companies included in other investments	16,000			14,500
Unrecognized tax benefits	77
Operating Lease, Right-of-Use Asset	1,044			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 $78 and $26)		Other assets (includes VIE balances of $78 and $26)	Other assets (includes VIE balances of $78 and $26)
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 87			$ 199
Private Equity Funds [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Funding commitments relating to limited partnerships and partially-owned investment companies	6,900			$ 6,400
Fixed Maturities [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Funding commitments relating to limited partnerships and partially-owned investment companies	1,300				$ 1,300
Fair Value Hedging
Financial Instruments Owned and Pledged as Collateral [Line Items]
Hedged Liability, Fair Value Hedge	2,000		€ 1,700
INA CNH Term Loan Due April 2028 [Member] | Net Investment Hedging | Designated as Hedging Instrument
Financial Instruments Owned and Pledged as Collateral [Line Items]
Notional Amount of Nonderivative Instruments	$ 254	¥ 1,800