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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 |

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