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Pension and Other Postretirement Healthcare Benefits - Schedule of Fair Value of Pension Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Change in plan assets: |  |
Fair value of plan assets, beginning of year | $ 263 |
Fair value of plan assets, end of year | 262 | $ 263
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 159 |
Fair value of plan assets, end of year | 131 | 159
Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 51 |
Fair value of plan assets, end of year | 40 | 51
Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 53 |
Fair value of plan assets, end of year | 91 | 53
Global equity securities |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 46 |
Fair value of plan assets, end of year | 34 | 46
Global equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 46 |
Fair value of plan assets, end of year | 34 | 46
Global equity securities | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Global equity securities | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Global commingled equity funds |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 36 |
Fair value of plan assets, end of year | 33 | 36
Global commingled equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 36 |
Fair value of plan assets, end of year | 33 | 36
Global commingled equity funds | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Global commingled equity funds | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
US government bonds |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 50 |
Fair value of plan assets, end of year | 58 | 50
US government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 50 |
Fair value of plan assets, end of year | 58 | 50
US government bonds | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
US government bonds | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Foreign government bonds |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 17 |
Fair value of plan assets, end of year |  | 17
Foreign government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 17 |
Fair value of plan assets, end of year |  | 17
Foreign government bonds | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year |  | 0
Foreign government bonds | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year |  | 0
US corporate bonds |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 31 |
Fair value of plan assets, end of year | 38 | 31
US corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
US corporate bonds | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 31 |
Fair value of plan assets, end of year | 38 | 31
US corporate bonds | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Foreign corporate bonds |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 19 |
Fair value of plan assets, end of year | 1 | 19
Foreign corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Foreign corporate bonds | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 19 |
Fair value of plan assets, end of year | 1 | 19
Foreign corporate bonds | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Property/ real estate fund |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 1 |
Fair value of plan assets, end of year | 1 | 1
Property/ real estate fund | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Property/ real estate fund | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 1 |
Fair value of plan assets, end of year | 1 | 1
Property/ real estate fund | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Insurance contracts |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 53 |
Fair value of plan assets, end of year | 91 | 53
Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Insurance contracts | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Insurance contracts | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 53 | 63
Actual return on plan assets | 3 | (4)
Purchases, sales, settlements | 31 | (5)
Transfers in/out of Level 3 | 0 | 0
Foreign currency rate changes | 4 | (1)
Fair value of plan assets, end of year | 91 | 53
Cash & cash equivalents |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 10 |
Fair value of plan assets, end of year | 6 | 10
Cash & cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 10 |
Fair value of plan assets, end of year | 6 | 10
Cash & cash equivalents | Significant Other Observable Inputs (Level 2) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | 0 | 0
Cash & cash equivalents | Significant Unobservable Inputs (Level 3) |  |
Change in plan assets: |  |
Fair value of plan assets, beginning of year | 0 |
Fair value of plan assets, end of year | $ 0 | $ 0

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