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Benefit Plans (Fair Value of Plan Assets Measured on a Recurring Basis) (Details) - Fair Value, Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 915 | $ 1,984
Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 618 | 1,584
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 57 | 225
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 548 | 1,345
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 13 | 14
Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 297 | 375
Fair Value Measured at Net Asset Value Per Share | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 25
Total fixed maturity securities | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 540 | 1,348
Total fixed maturity securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 10
Total fixed maturity securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 527 | 1,324
Total fixed maturity securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 13 | 14
Corporate and other bonds | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 413 | 1,057
Corporate and other bonds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 10
Corporate and other bonds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 408 | 1,041
Corporate and other bonds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5 | 6
States, municipalities and political subdivisions | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6 | 50
States, municipalities and political subdivisions | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
States, municipalities and political subdivisions | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6 | 50
States, municipalities and political subdivisions | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Asset-backed | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 121 | 241
Asset-backed | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Asset-backed | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 113 | 233
Asset-backed | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8 | 8
Equity securities | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 23 | 125
Equity securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8 | 119
Equity securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 15 | 6
Equity securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Short-term investments | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 47 | 96
Short-term investments | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 47 | 96
Short-term investments | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Short-term investments | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Other assets | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6 | 15
Other assets | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Other assets | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6 | 15
Other assets | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | $ 0
Cash | Total |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2 |
Cash | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2 |
Cash | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Cash | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  |

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