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Benefit Plans (Fair Values of Pension and Postretirement Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 6,545 | $ 6,775 | $ 6,603
Pension [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 508 | 1,114 |
Pension [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 69 | 81 |
Pension [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 54 | 33 |
Pension [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 3,572 | 3,160 |
Pension [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 582 | 716 |
Pension [Member] | Common stock: International equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 398 | 360 |
Pension [Member] | Common stock: U.S. equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 361 | 323 |
Pension [Member] | Asset-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 185 | 279 |
Pension [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 84 | 201 |
Pension [Member] | U S Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 445 | $ 388 |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | NAV [Member] | NAV [Member] |
Pension [Member] | U S Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 100 | $ 90 |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | NAV [Member] | NAV [Member] |
Pension [Member] | International Developed Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 53 | $ 55 |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | NAV [Member] | NAV [Member] |
Pension [Member] | Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 134 | $ (25) |
Pension [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 5,813 | 6,267 |
Pension [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 744 | 730 |
Pension [Member] | Level 1 [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 1 [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 1 [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 1 [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 1 [Member] | Common stock: International equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 398 | 360 |
Pension [Member] | Level 1 [Member] | Common stock: U.S. equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 361 | 323 |
Pension [Member] | Level 1 [Member] | Asset-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 1 [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | (15) | 47 |
Pension [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 5,069 | 5,537 |
Pension [Member] | Level 2 [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 508 | 1,114 |
Pension [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 69 | 81 |
Pension [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 54 | 33 |
Pension [Member] | Level 2 [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 3,572 | 3,160 |
Pension [Member] | Level 2 [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 582 | 716 |
Pension [Member] | Level 2 [Member] | Common stock: International equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 2 [Member] | Common stock: U.S. equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Pension [Member] | Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 185 | 279 |
Pension [Member] | Level 2 [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 99 | 154 |
Pension [Member] | NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 598 | 533 |
Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 84 | 102 | $ 122
Postretirement Benefit Plan [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 1 | 4 |
Postretirement Benefit Plan [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 2 | 2 |
Postretirement Benefit Plan [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 24 | 31 |
Postretirement Benefit Plan [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 2 | 4 |
Postretirement Benefit Plan [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 8 | 4 |
Postretirement Benefit Plan [Member] | U S Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 35 | $ 44 |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | NAV [Member] | NAV [Member] |
Postretirement Benefit Plan [Member] | International Developed Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 12 | $ 11 |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | NAV [Member] | NAV [Member] |
Postretirement Benefit Plan [Member] | Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 0 | $ 2 |
Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 37 | 45 |
Postretirement Benefit Plan [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 1 |
Postretirement Benefit Plan [Member] | Level 1 [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Postretirement Benefit Plan [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Postretirement Benefit Plan [Member] | Level 1 [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Postretirement Benefit Plan [Member] | Level 1 [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
Postretirement Benefit Plan [Member] | Level 1 [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 1 |
Postretirement Benefit Plan [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 37 | 44 |
Postretirement Benefit Plan [Member] | Level 2 [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 1 | 4 |
Postretirement Benefit Plan [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 2 | 2 |
Postretirement Benefit Plan [Member] | Level 2 [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 24 | 31 |
Postretirement Benefit Plan [Member] | Level 2 [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 2 | 4 |
Postretirement Benefit Plan [Member] | Level 2 [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 8 | 3 |
Postretirement Benefit Plan [Member] | NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 47 | $ 55 |

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