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Retirement Benefits and Trusteed Assets (Pension Plan - Fair Value Measurements) (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 3,897 | $ 5,507 | $ 5,497
Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 77 | 112 |
Equity Securities, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 483 | 913 |
Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 481 | 676 |
Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 583 | 1,026 |
Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,203 | 1,466 |
Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 321 | 567 |
Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 749 | 747 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 734 | 1,437 |
Level 1 | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 77 | 112 |
Level 1 | Equity Securities, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0 | 155 |
Level 1 | Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 65 | 88 |
Level 1 | Fixed Income Securities, Governmental |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 506 | 943 |
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 | 86 | 139 |
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 | 1,330 | 1,612 |
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 | 77 | 83 |
Level 2 | Fixed Income Securities, Corporate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1,203 | 1,466 |
Level 2 | Hedge Funds and Similar Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 50 | 63 |
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 | 1,833 | 2,458 |
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 | 483 | 758 |
Other | Equity Securities, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 416 | 588 |
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 | 185 | 365 |
Other | Private Equity and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 749 | $ 747 |

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