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Commitments, Contingencies, And Guarantees (Balance Sheet Locations, Fair Values In Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Foreign currency forward contracts | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 4,695 $ 3,959
Options/Futures/Forward contracts on notes and bonds | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,096 449
Convertible securities | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [1] 7 12
Investment And Embedded Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 29 53
Fair Value, Liability (173) (303)
Derivative, Notional Amount 5,798 4,420
Futures contracts on equities | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [2] 909 1,047
Other derivative instruments | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 435 211
Other Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,344 1,258
Currency Swap [Member] | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 261 146
Fair Value, Liability (183) 116
Derivative, Notional Amount 5,062 4,475
Currency Swap [Member] | Fair Value Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,048 1,579
Currency Swap [Member] | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 3,014 2,896
Other Assets [Member] | Foreign currency forward contracts | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 18 41
Other Assets [Member] | Options/Futures/Forward contracts on notes and bonds | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 4 0
Other Assets [Member] | Futures contracts on equities | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [2] 0 35
Other Assets [Member] | Other derivative instruments | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5 0
Other Assets [Member] | Other Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5 35
Other Assets [Member] | Currency Swap [Member] | Fair Value Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 216 103
Other Assets [Member] | Currency Swap [Member] | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 45 43
Fixed Maturities [Member] | Convertible securities | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Not Subject to Master Netting Arrangement [1] 7 12
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (169) (295)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures/Forward contracts on notes and bonds | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (4) (8)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on equities | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability [2] (11) 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other derivative instruments | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (5) (2)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (16) (2)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Currency Swap [Member] | Fair Value Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability 0 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Currency Swap [Member] | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (183) (116)
Equity Securities | Convertible securities | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Not Subject to Master Netting Arrangement [1] $ 0 $ 0
[1] Includes fair value of embedded derivatives.
[2] Related to MRB book of business.