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Employee Benefit Plans (Estimated Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 7,836 | $ 8,270 | $ 8,294
Pension Benefits | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6,409 | 6,714 |
Pension Benefits | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,081 | 3,083 |
Pension Benefits | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,723 | 1,575 |
Pension Benefits | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 731 | 810 |
Pension Benefits | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 179 | 203 |
Pension Benefits | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 79 | 147 |
Pension Benefits | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 170 | 197 |
Pension Benefits | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 446 | 699 |
Pension Benefits | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 695 | 610 |
Pension Benefits | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 727 | 869 |
Pension Benefits | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5 | 77 |
Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,499 | 2,213 |
Pension Benefits | Level 1 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,964 | 1,726 |
Pension Benefits | Level 1 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 1 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,693 | 1,537 |
Pension Benefits | Level 1 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 1 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 96 | 62 |
Pension Benefits | Level 1 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 1 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 13 |
Pension Benefits | Level 1 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 173 | 114 |
Pension Benefits | Level 1 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 489 | 436 |
Pension Benefits | Level 1 | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 42 | 41 |
Pension Benefits | Level 1 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4 | 10 |
Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,589 | 5,153 |
Pension Benefits | Level 2 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,385 | 4,924 |
Pension Benefits | Level 2 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,025 | 3,029 |
Pension Benefits | Level 2 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 30 | 38 |
Pension Benefits | Level 2 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 729 | 808 |
Pension Benefits | Level 2 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 83 | 141 |
Pension Benefits | Level 2 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 79 | 147 |
Pension Benefits | Level 2 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 168 | 184 |
Pension Benefits | Level 2 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 271 | 577 |
Pension Benefits | Level 2 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 198 | 162 |
Pension Benefits | Level 2 | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5 | 0 |
Pension Benefits | Level 2 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 67 |
Pension Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 748 | 904 |
Pension Benefits | Level 3 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 60 | 64 |
Pension Benefits | Level 3 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 56 | 54 | 55
Pension Benefits | Level 3 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 2 | 0
Pension Benefits | Level 3 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Level 3 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 8 | 3
Pension Benefits | Level 3 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 12 | 3
Pension Benefits | Level 3 | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 680 | 828 | 855
Pension Benefits | Level 3 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,329 | 1,334 | $ 1,303
Other Postretirement Benefits | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,270 | 1,274 |
Other Postretirement Benefits | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 175 | 167 |
Other Postretirement Benefits | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 109 | 58 |
Other Postretirement Benefits | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 38 | 46 |
Other Postretirement Benefits | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 1 |
Other Postretirement Benefits | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5 | 8 |
Other Postretirement Benefits | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 875 | 957 |
Other Postretirement Benefits | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 66 | 37 |
Other Postretirement Benefits | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 58 | 59 |
Other Postretirement Benefits | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Other Postretirement Benefits | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 641 | 671 |
Other Postretirement Benefits | Level 1 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 582 | 611 |
Other Postretirement Benefits | Level 1 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 1 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 102 | 52 |
Other Postretirement Benefits | Level 1 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 1 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Other Postretirement Benefits | Level 1 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 1 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 469 | 554 |
Other Postretirement Benefits | Level 1 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10 | 4 |
Other Postretirement Benefits | Level 1 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 58 | 59 |
Other Postretirement Benefits | Level 1 | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Other Postretirement Benefits | Level 1 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 688 | 663 |
Other Postretirement Benefits | Level 2 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 688 | 663 |
Other Postretirement Benefits | Level 2 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 175 | 167 |
Other Postretirement Benefits | Level 2 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 7 | 6 |
Other Postretirement Benefits | Level 2 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 38 | 46 |
Other Postretirement Benefits | Level 2 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 0 |
Other Postretirement Benefits | Level 2 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5 | 8 |
Other Postretirement Benefits | Level 2 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 406 | 403 |
Other Postretirement Benefits | Level 2 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 56 | 33 |
Other Postretirement Benefits | Level 2 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 2 | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 2 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Other invested assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 3 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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