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Employee Benefit Plans (Estimated Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 8,294 | $ 10,971 | $ 11,256
Pension Benefits | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6,802 | 9,065 |
Pension Benefits | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,001 | 4,305 |
Pension Benefits | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,507 | 1,904 |
Pension Benefits | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 769 | 1,116 |
Pension Benefits | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 277 | 83 |
Pension Benefits | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 159 | 248 |
Pension Benefits | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 396 | 626 |
Pension Benefits | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 693 | 783 |
Pension Benefits | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 570 | 895 |
Pension Benefits | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 896 | 997 |
Pension Benefits | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 26 | 14 |
Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,130 | 2,778 |
Pension Benefits | Level 1 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,653 | 2,121 |
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 | 1,462 | 1,824 |
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 | 87 | 0 |
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 | 12 | 142 |
Pension Benefits | Level 1 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 92 | 155 |
Pension Benefits | Level 1 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 416 | 601 |
Pension Benefits | Level 1 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 40 | 42 |
Pension Benefits | Level 1 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 21 | 14 |
Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5,244 | 7,226 |
Pension Benefits | Level 2 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5,091 | 6,942 |
Pension Benefits | Level 2 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,946 | 4,305 |
Pension Benefits | Level 2 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 45 | 80 |
Pension Benefits | Level 2 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 769 | 1,115 |
Pension Benefits | Level 2 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 190 | 83 |
Pension Benefits | Level 2 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 159 | 248 |
Pension Benefits | Level 2 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 384 | 484 |
Pension Benefits | Level 2 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 598 | 627 |
Pension Benefits | Level 2 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 151 | 283 |
Pension Benefits | Level 2 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Pension Benefits | Level 2 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 0 |
Pension Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 920 | 967 |
Pension Benefits | Level 3 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 58 | 2 |
Pension Benefits | Level 3 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 55 | 0 | 0
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 | 0 | 1 | 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 | 3 | 1 | 0
Pension Benefits | Level 3 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3 | 11 | 0
Pension Benefits | Level 3 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 855 | 954 |
Pension Benefits | Level 3 | Derivative assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4 | 0 |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,303 | 1,443 | $ 1,492
Other Postretirement Benefits | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,256 | 1,387 |
Other Postretirement Benefits | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 205 | 222 |
Other Postretirement Benefits | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 68 | 69 |
Other Postretirement Benefits | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 61 | 51 |
Other Postretirement Benefits | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4 | 10 |
Other Postretirement Benefits | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 15 | 8 |
Other Postretirement Benefits | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 859 | 968 |
Other Postretirement Benefits | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 44 | 59 |
Other Postretirement Benefits | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 47 | 55 |
Other Postretirement Benefits | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 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 | 589 | 625 |
Other Postretirement Benefits | Level 1 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 542 | 569 |
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 | 68 | 69 |
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 | 3 | 0 |
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 | 463 | 486 |
Other Postretirement Benefits | Level 1 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 14 |
Other Postretirement Benefits | Level 1 | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 47 | 55 |
Other Postretirement Benefits | Level 1 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 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 | 714 | 818 |
Other Postretirement Benefits | Level 2 | Fixed maturity securities AFS |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 714 | 818 |
Other Postretirement Benefits | Level 2 | Corporate fixed maturity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 205 | 222 |
Other Postretirement Benefits | Level 2 | U.S. government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Level 2 | Foreign government |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 61 | 51 |
Other Postretirement Benefits | Level 2 | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 10 |
Other Postretirement Benefits | Level 2 | Municipals |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 15 | 8 |
Other Postretirement Benefits | Level 2 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 396 | 482 |
Other Postretirement Benefits | Level 2 | Other (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 36 | 45 |
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 investments |  |  |
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 investments |  |  |
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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