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Pension and Other Postretirement Employee Benefit Plans (Fair Values of Pension Plan Assets) (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | $ 2,693 | $ 2,704
Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 604 | 638
Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 708 | 706
Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 1,312 | 1,344
Cash and equivalents | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 209 | 116
Cash and equivalents | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Cash and equivalents | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Cash and equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 209 | 116
Equity securities, common stock | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 276 | 410
Equity securities, common stock | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Equity securities, common stock | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Equity securities, common stock | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 276 | 410
Equity securities, preferred stock | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 1 | 0
Equity securities, preferred stock | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Equity securities, preferred stock | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Equity securities, preferred stock | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 1 | 0
Fixed income securities, corporate bonds | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Fixed income securities, corporate bonds | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 252 | 278
Fixed income securities, corporate bonds | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Fixed income securities, corporate bonds | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 252 | 278
Fixed income securities, government issued | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Fixed income securities, government issued | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 24 | 25
Fixed income securities, government issued | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Fixed income securities, government issued | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 24 | 25
Mutual funds | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 118 | 112
Mutual funds | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 164 | 167
Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Mutual funds | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 282 | 279
Insurance contracts | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Insurance contracts | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 268 | 236
Insurance contracts | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 268 | 236
Common/collective trusts | Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 1,013 | 906
Venture capital, partnerships and other private investments | Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | $ 368 | $ 454

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