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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value $ 8,450 $ 9,362
Estimated fair value of debt securities, Unrealized loss position 7,832 $ 5,772
Bank Loans    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 152  
Estimated fair value of debt securities, Unrealized loss position 151  
High Yield Corporate Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 62  
Emerging Market Securities    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 68  
Estimated fair value of debt securities, Unrealized loss position 66  
Non-Investment Grade    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 219  
Estimated fair value of debt securities, Unrealized loss position 218  
Non-Investment Grade | Bank Loans    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 148  
Estimated fair value of debt securities, Unrealized loss position 147  
Non-Investment Grade | High Yield Corporate Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Estimated fair value of debt securities, Unrealized loss position 62  
Non-Investment Grade | Emerging Market Securities    
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, Estimated fair value 9  
Estimated fair value of debt securities, Unrealized loss position $ 9