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Debt Securities (Investments in Debt Securities by Contractual Maturity) (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Debt securities, amortized cost $ 9,317 $ 6,121
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 9,362 6,355
U.S. Treasury bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 16  
Amortized cost, Due after one through five years 58  
Amortized cost, Due after five through ten years 25  
Amortized cost, Due after ten years 24  
Debt securities, amortized cost 123 80
Estimated fair value, Due in one year or less 16  
Estimated fair value, Due after one through five years 58  
Estimated fair value, Due after five through ten years 25  
Estimated fair value, Due after ten years 24  
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 123 81
Municipal bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 24  
Amortized cost, Due after one through five years 103  
Amortized cost, Due after five through ten years 812  
Amortized cost, Due after ten years 668  
Debt securities, amortized cost 1,607 1,168
Estimated fair value, Due in one year or less 25  
Estimated fair value, Due after one through five years 107  
Estimated fair value, Due after five through ten years 829  
Estimated fair value, Due after ten years 688  
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 1,649 1,248
Foreign government bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 38  
Amortized cost, Due after one through five years 107  
Amortized cost, Due after five through ten years 73  
Amortized cost, Due after ten years 10  
Debt securities, amortized cost 228 194
Estimated fair value, Due in one year or less 38  
Estimated fair value, Due after one through five years 108  
Estimated fair value, Due after five through ten years 71  
Estimated fair value, Due after ten years 10  
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 227 199
Governmental agency bonds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 18  
Amortized cost, Due after one through five years 58  
Amortized cost, Due after five through ten years 32  
Amortized cost, Due after ten years 67  
Debt securities, amortized cost 175 254
Estimated fair value, Due in one year or less 18  
Estimated fair value, Due after one through five years 59  
Estimated fair value, Due after five through ten years 32  
Estimated fair value, Due after ten years 68  
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 177 264
U.S. corporate debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 45  
Amortized cost, Due after one through five years 546  
Amortized cost, Due after five through ten years 402  
Amortized cost, Due after ten years 78  
Debt securities, amortized cost 1,071 638
Estimated fair value, Due in one year or less 45  
Estimated fair value, Due after one through five years 553  
Estimated fair value, Due after five through ten years 401  
Estimated fair value, Due after ten years 82  
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 1,081 682
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 267  
Amortized cost, Due after five through ten years 145  
Amortized cost, Due after ten years 46  
Debt securities, amortized cost 493 385
Estimated fair value, Due in one year or less 36  
Estimated fair value, Due after one through five years 269  
Estimated fair value, Due after five through ten years 145  
Estimated fair value, Due after ten years 48  
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 498 $ 407
Debt Securities Excluding Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, Due in one year or less 176  
Amortized cost, Due after one through five years 1,139  
Amortized cost, Due after five through ten years 1,489  
Amortized cost, Due after ten years 893  
Debt securities, amortized cost 3,697  
Estimated fair value, Due in one year or less 178  
Estimated fair value, Due after one through five years 1,154  
Estimated fair value, Due after five through ten years 1,503  
Estimated fair value, Due after ten years 920  
Debt securities, includes pledged securities of $91 and $94 (amortized cost of $9,317 and $6,121) 3,755  
Total Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 5,620  
Estimated fair value $ 5,607