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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
Dec. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Future policy benefits $ 5,947 $ 5,713
Derivative, Notional Amount 19,138 4,567
Foreign currency forward contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 6,182 2,807
Futures contracts on notes and bonds [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12,944 1,749
Convertible Securities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 12 11
Futures contracts on equities    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 905 709
Other    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 3 16
Other Derivative Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 908 725
Guaranteed Minimum Income Benefit    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount [1] 1,432 1,658
Accounts Payable and Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability (166) (52)
Accounts Payable and Accrued Liabilities [Member] | Foreign currency forward contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability (139) (49)
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on notes and bonds [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability (27) (3)
Accounts Payable and Accrued Liabilities [Member] | Convertible Securities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability [2] 0 0
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on equities    
Derivatives, Fair Value [Line Items]    
Derivative Liability [3] (16) (17)
Accounts Payable and Accrued Liabilities [Member] | Other    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0 0
Accounts Payable and Accrued Liabilities [Member] | Other Derivative Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability (16) (17)
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 69 44
Other Assets [Member] | Foreign currency forward contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 25 22
Other Assets [Member] | Futures contracts on notes and bonds [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 33 13
Other Assets [Member] | Futures contracts on equities    
Derivatives, Fair Value [Line Items]    
Derivative Asset [3] 0 0
Other Assets [Member] | Other    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Other Assets [Member] | Other Derivative Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Other Assets [Member] | Guaranteed Minimum Income Benefit    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Accounts Payable Future Policy Benefits [Member] | Guaranteed Minimum Income Benefit    
Derivatives, Fair Value [Line Items]    
Derivative Liability (745) (1,089)
Available-for-sale Securities [Member] | Convertible Securities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset [2] 11 9
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 745 1,089
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross $ 745 $ 1,089
[1] Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts
[2] Includes fair value of embedded derivatives.
[3] Related to GMDB and GLB book of business.