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Debt Securities (Debt Securities Investment Portfolio) (Narrative) (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value $ 8,170 $ 9,362
Bank Loans    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 126  
High Yield Corporate Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 44  
Emerging Market Securities    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 54  
Non-Investment Grade    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 171  
Non-Investment Grade | Bank Loans    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 121  
Non-Investment Grade | Emerging Market Securities    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value $ 6