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Benefit Plans (Fair Values of Pension and Postretirement Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 6,603 | $ 8,793 | $ 8,911
Pension [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 1,098 | 1,147 |
Pension [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 82 | 60 |
Pension [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 32 | 88 |
Pension [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 2,747 | 3,442 |
Pension [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 756 | 1,032 |
Pension [Member] | Common stock: International equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 327 | 373 |
Pension [Member] | Common stock: U.S. equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 591 | 856 |
Pension [Member] | Asset-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 161 | 89 |
Pension [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 243 | 200 |
Pension [Member] | U S Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 312 | $ 873 |
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 | $ 75 | $ 462 |
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 | $ 49 | $ 125 |
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 | $ 130 | $ 46 |
Pension [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 6,037 | 7,287 |
Pension [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 917 | 1,281 |
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 | 327 | 373 |
Pension [Member] | Level 1 [Member] | Common stock: U.S. equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 591 | 856 |
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 | (1) | 52 |
Pension [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 5,120 | 6,006 |
Pension [Member] | Level 2 [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 1,098 | 1,147 |
Pension [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 82 | 60 |
Pension [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 32 | 88 |
Pension [Member] | Level 2 [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 2,747 | 3,442 |
Pension [Member] | Level 2 [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 756 | 1,032 |
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 | 161 | 89 |
Pension [Member] | Level 2 [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 244 | 148 |
Pension [Member] | NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 436 | 1,460 |
Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 122 | 185 | $ 201
Postretirement Benefit Plan [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 5 | 5 |
Postretirement Benefit Plan [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 2 | 3 |
Postretirement Benefit Plan [Member] | Corporate Debt Security, Above Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 37 | 55 |
Postretirement Benefit Plan [Member] | Corporate Debt Security, Below Investment Grade [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 7 | 10 |
Postretirement Benefit Plan [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 3 | 0 |
Postretirement Benefit Plan [Member] | U S Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 47 | $ 84 |
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 | $ 18 | $ 25 |
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 | $ 3 | $ 3 |
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 | 54 | 73 |
Postretirement Benefit Plan [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 0 | 0 |
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 | 0 |
Postretirement Benefit Plan [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 54 | 73 |
Postretirement Benefit Plan [Member] | Level 2 [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 5 | 5 |
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 | 3 |
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 | 37 | 55 |
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 | 7 | 10 |
Postretirement Benefit Plan [Member] | Level 2 [Member] | Other, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | 3 | 0 |
Postretirement Benefit Plan [Member] | NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, net | $ 65 | $ 109 |

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