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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