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Debt Securities (Investments in Debt Securities by Contractual Maturity) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, amortized cost | $ 9,170 | $ 9,317
Debt securities, estimated fair value | 8,170 | 9,362
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 143 |
Amortized cost, Due after one through five years | 141 |
Amortized cost, Due after five through ten years | 6 |
Amortized cost, Due after ten years | 19 |
Debt securities, amortized cost | 309 | 123
Estimated fair value, Due in one year or less | 143 |
Estimated fair value, Due after one through five years | 137 |
Estimated fair value, Due after five through ten years | 5 |
Estimated fair value, Due after ten years | 18 |
Debt securities, estimated fair value | 303 | 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 | 288 |
Amortized cost, Due after five through ten years | 758 |
Amortized cost, Due after ten years | 604 |
Debt securities, amortized cost | 1,671 | 1,607
Estimated fair value, Due in one year or less | 21 |
Estimated fair value, Due after one through five years | 268 |
Estimated fair value, Due after five through ten years | 669 |
Estimated fair value, Due after ten years | 521 |
Debt securities, estimated fair value | 1,479 | 1,649
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 36 |
Amortized cost, Due after one through five years | 95 |
Amortized cost, Due after five through ten years | 71 |
Amortized cost, Due after ten years | 6 |
Debt securities, amortized cost | 208 | 228
Estimated fair value, Due in one year or less | 36 |
Estimated fair value, Due after one through five years | 93 |
Estimated fair value, Due after five through ten years | 60 |
Estimated fair value, Due after ten years | 5 |
Debt securities, estimated fair value | 194 | 227
Governmental agency 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 | 157 |
Amortized cost, Due after five through ten years | 7 |
Amortized cost, Due after ten years | 58 |
Debt securities, amortized cost | 248 | 175
Estimated fair value, Due in one year or less | 25 |
Estimated fair value, Due after one through five years | 151 |
Estimated fair value, Due after five through ten years | 6 |
Estimated fair value, Due after ten years | 47 |
Debt securities, estimated fair value | 229 | 177
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 55 |
Amortized cost, Due after one through five years | 687 |
Amortized cost, Due after five through ten years | 199 |
Amortized cost, Due after ten years | 63 |
Debt securities, amortized cost | 1,004 | 1,071
Estimated fair value, Due in one year or less | 54 |
Estimated fair value, Due after one through five years | 629 |
Estimated fair value, Due after five through ten years | 186 |
Estimated fair value, Due after ten years | 52 |
Debt securities, estimated fair value | 921 | 1,081
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 20 |
Amortized cost, Due after one through five years | 300 |
Amortized cost, Due after five through ten years | 116 |
Amortized cost, Due after ten years | 41 |
Debt securities, amortized cost | 477 | 493
Estimated fair value, Due in one year or less | 20 |
Estimated fair value, Due after one through five years | 280 |
Estimated fair value, Due after five through ten years | 107 |
Estimated fair value, Due after ten years | 36 |
Debt securities, estimated fair value | 443 | $ 498
Debt Securities Excluding Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, Due in one year or less | 301 |
Amortized cost, Due after one through five years | 1,668 |
Amortized cost, Due after five through ten years | 1,157 |
Amortized cost, Due after ten years | 791 |
Debt securities, amortized cost | 3,917 |
Estimated fair value, Due in one year or less | 299 |
Estimated fair value, Due after one through five years | 1,558 |
Estimated fair value, Due after five through ten years | 1,033 |
Estimated fair value, Due after ten years | 679 |
Debt securities, estimated fair value | 3,569 |
Total Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 5,253 |
Estimated fair value | $ 4,601 |

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