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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Significant Accounting Policies [Line Items]      
Fair value of loaned securities held $ 10,800 $ 9,300  
Fair value of collateral loan under these securities lending agreements 11,700 10,100  
Separate account collateral held under securities lending agreements 6,355 $ 4,558  
Fair value of securities received as collateral have been resold or repledged $ 0   $ 0
Minimum [Member]      
Significant Accounting Policies [Line Items]      
Collateral cash and securities received in exchange of value of securities lent in order to reduce counterparty risk 102.00%    
Maximum [Member]      
Significant Accounting Policies [Line Items]      
Collateral cash and securities received in exchange of value of securities lent in order to reduce counterparty risk 112.00%