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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, 2023
Dec. 31, 2022
Foreign currency forward contracts    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 3,711 $ 4,134
Options/Futures contracts on notes and bonds    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,150 1,511
Convertible securities    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [1] 61 37
Investment And Embedded Derivative Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 95 112
Fair Value, Liability (168) (139)
Derivative, Notional Amount 5,922 5,682
Futures contracts on equities    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [2] 1,119 939
Other Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 368 0
Other Derivative Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,487 939
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 48 17
Fair Value, Liability (68) 53
Derivative, Notional Amount 3,203 3,199
Fair Value Hedging    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,609 1,595
Net Investment Hedging    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,594 1,604
Other Assets [Member] | Foreign currency forward contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 15 64
Other Assets [Member] | Options/Futures contracts on notes and bonds    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 27 18
Other Assets [Member] | Futures contracts on equities    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [2] 48 33
Other Assets [Member] | Other Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5 0
Other Assets [Member] | Other Derivative Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 53 33
Other Assets [Member] | Fair Value Hedging    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 48 17
Other Assets [Member] | Net Investment Hedging    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Fixed Maturities [Member] | Convertible securities    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 53 30
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (147) (115)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes and bonds    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (21) (24)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on equities    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability [2] 0 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (4) 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (4) 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Fair Value Hedging    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability 0 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Net Investment Hedging    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability (68) (53)
Equity Securities | Convertible securities    
Derivatives, Fair Value [Line Items]    
Fair Value, Liability [1] $ 0 $ 0
[1] Includes fair value of embedded derivatives.
[2] Related to MRB book of business.