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Retirement Benefits and Trusteed Assets (Pension Plan - Fair Value Measurements) (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 3,758 | $ 3,960 | $ 3,897
Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 97 | 100 |
Equity Securities, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 349 | 550 |
Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 223 | 364 |
Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 703 | 609 |
Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,350 | 1,323 |
Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 318 | 282 |
Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 718 | 732 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 896 | 790 |
Level 1 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 97 | 100 |
Level 1 | Equity Securities, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Level 1 | Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 35 | 55 |
Level 1 | Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 627 | 531 |
Level 1 | Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Level 1 | Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 137 | 104 |
Level 1 | Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,440 | 1,469 |
Level 2 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Level 2 | Equity Securities, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Level 2 | Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Level 2 | Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 76 | 78 |
Level 2 | Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,350 | 1,323 |
Level 2 | Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 14 | 68 |
Level 2 | Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,422 | 1,701 |
Other | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Other | Equity Securities, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 349 | 550 |
Other | Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 188 | 309 |
Other | Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Other | Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 0 |
Other | Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 167 | 110 |
Other | Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 718 | $ 732 |

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