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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, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | $ 2,704 | $ 2,629
Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 638 | 648
Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 706 | 477
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 | 1,344 | 1,125
Cash and equivalents | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 116 | 113
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 | 116 | 113
Equity securities, common stock | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 410 | 379
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 | 410 | 379
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 | 278 | 129
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 | 278 | 129
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 | 25 | 24
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 | 25 | 24
Mutual funds | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 112 | 156
Mutual funds | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 167 | 118
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 | 279 | 274
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 | 236 | 206
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 | 236 | 206
Common/collective trusts | Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 906 | 811
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 | $ 454 | $ 693

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