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Debt Securities (Investments in Debt Securities by Contractual Maturity) (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Debt Securities, Amortized cost $ 9,257 $ 9,317
Debt securities, Estimated fair value 8,450 9,362
U.S. Treasury bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 60  
Amortized cost, Due after one through five years 59  
Amortized cost, Due after five through ten years 25  
Amortized cost, Due after ten years 11  
Debt Securities, Amortized cost 155 123
Estimated fair value, Due in one year or less 60  
Estimated fair value, Due after one through five years 55  
Estimated fair value, Due after five through ten years 22  
Estimated fair value, Due after ten years 10  
Debt securities, Estimated fair value 147 123
Municipal bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 21  
Amortized cost, Due after one through five years 146  
Amortized cost, Due after five through ten years 813  
Amortized cost, Due after ten years 629  
Debt Securities, Amortized cost 1,609 1,607
Estimated fair value, Due in one year or less 21  
Estimated fair value, Due after one through five years 141  
Estimated fair value, Due after five through ten years 744  
Estimated fair value, Due after ten years 556  
Debt securities, Estimated fair value 1,462 1,649
Foreign government bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 26  
Amortized cost, Due after one through five years 108  
Amortized cost, Due after five through ten years 71  
Amortized cost, Due after ten years 12  
Debt Securities, Amortized cost 217 228
Estimated fair value, Due in one year or less 26  
Estimated fair value, Due after one through five years 105  
Estimated fair value, Due after five through ten years 60  
Estimated fair value, Due after ten years 9  
Debt securities, Estimated fair value 200 227
Governmental agency bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 1  
Amortized cost, Due after one through five years 74  
Amortized cost, Due after five through ten years 7  
Amortized cost, Due after ten years 59  
Debt Securities, Amortized cost 141 175
Estimated fair value, Due in one year or less 1  
Estimated fair value, Due after one through five years 69  
Estimated fair value, Due after five through ten years 7  
Estimated fair value, Due after ten years 52  
Debt securities, Estimated fair value 129 177
U.S. corporate debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 47  
Amortized cost, Due after one through five years 648  
Amortized cost, Due after five through ten years 310  
Amortized cost, Due after ten years 91  
Debt Securities, Amortized cost 1,096 1,071
Estimated fair value, Due in one year or less 47  
Estimated fair value, Due after one through five years 603  
Estimated fair value, Due after five through ten years 278  
Estimated fair value, Due after ten years 75  
Debt securities, Estimated fair value 1,003 1,081
Foreign corporate debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 35  
Amortized cost, Due after one through five years 297  
Amortized cost, Due after five through ten years 116  
Amortized cost, Due after ten years 52  
Debt Securities, Amortized cost 500 493
Estimated fair value, Due in one year or less 35  
Estimated fair value, Due after one through five years 278  
Estimated fair value, Due after five through ten years 103  
Estimated fair value, Due after ten years 43  
Debt securities, Estimated fair value 459 $ 498
Aggregate Debt Securities Excluding Mortgage Backed And Asset Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 190  
Amortized cost, Due after one through five years 1,332  
Amortized cost, Due after five through ten years 1,342  
Amortized cost, Due after ten years 854  
Debt Securities, Amortized cost 3,718  
Estimated fair value, Due in one year or less 190  
Estimated fair value, Due after one through five years 1,251  
Estimated fair value, Due after five through ten years 1,214  
Estimated fair value, Due after ten years 745  
Debt securities, Estimated fair value 3,400  
Collateralized Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 5,539  
Estimated fair value $ 5,050