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Employee Benefits - Schedule of Rollforward Changes in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amounts recognized on the balance sheet:      
Noncurrent liability $ (167) $ (217)  
Pension Benefits      
Change in benefit obligation:      
Benefit obligation, beginning balance 1,560 1,622  
Service cost 15 17 $ 17
Interest cost 87 83 85
Plan participants' contributions 0 0  
Actuarial loss (gain) 35 (55)  
Settlements 0 (2)  
Gross benefits paid (179) (105)  
Federal subsidy 0 0  
Benefit obligation, ending balance 1,518 1,560 1,622
Change in plan assets:      
Fair value of plan assets, beginning balance 1,392 1,431  
Actual return on plan assets 152 19  
Employer contributions 46 49  
Plan participants' contributions 0 0  
Settlements 0 (2)  
Benefits paid (179) (105)  
Fair value of plan assets, ending balance 1,411 1,392 1,431
Funded status, ending balance (107) (168)  
Amounts recognized on the balance sheet:      
Noncurrent asset 62 51  
Current liability (2) (2)  
Noncurrent liability (167) (217)  
Net amount recognized (107) (168)  
Other Benefits      
Change in benefit obligation:      
Benefit obligation, beginning balance 225 247  
Service cost 2 2 2
Interest cost 12 12 14
Plan participants' contributions 3 3  
Actuarial loss (gain) 3 (18)  
Settlements 0 0  
Gross benefits paid (22) (22)  
Federal subsidy 1 1  
Benefit obligation, ending balance 224 225 247
Change in plan assets:      
Fair value of plan assets, beginning balance 253 258  
Actual return on plan assets 19 11  
Employer contributions 3 3  
Plan participants' contributions 3 3  
Settlements 0 0  
Benefits paid (22) (22)  
Fair value of plan assets, ending balance 256 253 $ 258
Funded status, ending balance 32 28  
Amounts recognized on the balance sheet:      
Noncurrent asset 33 29  
Current liability 0 0  
Noncurrent liability (1) (1)  
Net amount recognized $ 32 $ 28