v3.22.0.1
Significant Accounting Policies - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Segment
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Jun. 30, 2021
Oct. 06, 2020
shares
Significant Accounting Policies [Line Items]          
Fair value of loaned securities $ 13,200 $ 15,200      
Fair value of collateral for loan securities 14,100 16,500      
Separate account collateral held under securities lending agreements 7,081 16,507      
Fair value of securities received as collateral have been resold or repledged 0 0      
Securities lending revenue earned 555 652 $ 617    
Reduction of management fees $ 500 $ 35      
Preferred stock shares outstanding | shares 0 0     0
Number of business segments | Segment 1        
Restricted Stock Units (RSUs) [Member]          
Significant Accounting Policies [Line Items]          
Discrete income tax benefit for vested stock awards $ 43 $ 36 $ 23    
Equipment and Computer Software [Member]          
Significant Accounting Policies [Line Items]          
Estimated useful life 3 years        
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%        
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%