v3.24.0.1
Significant Accounting Policies - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Significant Accounting Policies [Line Items]      
Fair value of loaned securities held $ 9,300 $ 10,200  
Fair value of collateral loan under these securities lending agreements 10,100 11,000  
Separate account collateral held under securities lending agreements 4,558 5,765  
Fair value of securities received as collateral have been resold or repledged 0 0  
Securities lending revenue earned 675 599 $ 555
Reduction of management fees $ 0 72 500
Number of business segments | Segment 1    
Restricted Stock Units (RSUs) [Member]      
Significant Accounting Policies [Line Items]      
Discrete income tax benefit for vested stock awards $ 41 $ 87 $ 43
Equipment and Computer Software [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful life 3 years    
Leasehold Improvements [Member]      
Significant Accounting Policies [Line Items]      
Property and equipment transfers $ 400    
Minimum [Member]      
Significant Accounting Policies [Line Items]      
VIE, economic interest percentage 10.00%    
Collateral cash and securities received in exchange of value of securities lent in order to reduce counterparty risk 102.00%    
Minimum [Member] | Leasehold Improvements [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful life 1 year    
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%    
Maximum [Member] | WMC [Member]      
Significant Accounting Policies [Line Items]      
Ownership percentage 50.10%    
Maximum [Member] | Leasehold Improvements [Member]      
Significant Accounting Policies [Line Items]      
Estimated useful life 15 years