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Retirement Benefits and Trusteed Assets (Pension Plan - Fair Value Measurements) (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 3,960 | $ 3,897 | $ 5,507
Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 100 | 77 |
Equity Securities, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 550 | 483 |
Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 364 | 481 |
Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 609 | 583 |
Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,323 | 1,203 |
Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 282 | 321 |
Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 732 | 749 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 790 | 734 |
Level 1 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 100 | 77 |
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 | 55 | 65 |
Level 1 | Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 531 | 506 |
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 | 104 | 86 |
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 | 1,469 | 1,330 |
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 | 78 | 77 |
Level 2 | Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,323 | 1,203 |
Level 2 | Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 68 | 50 |
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 | 1,701 | 1,833 |
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 | 550 | 483 |
Other | Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 309 | 416 |
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 | 110 | 185 |
Other | Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 732 | $ 749 |

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