v3.26.1
Employee Benefits - Changes in PBO and Changes in FVA (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning of year $ 846 $ 923  
Interest cost 43 41 $ 45
Actuarial losses (gains) 14 (34)  
Plan participants’ contributions 0 0  
Benefit payments (81) (84)  
End of year 822 846 923
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
FVA at beginning of year 805 827  
Actual return on plan assets 53 49  
Employer contributions 13 13  
Plan participants’ contributions 0 0  
Benefit payments (81) (84)  
FVA at end of year 790 805 827
Postretirement Benefit Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning of year 41 40  
Interest cost 2 2 2
Actuarial losses (gains) 7 6  
Plan participants’ contributions 2 1  
Benefit payments (8) (8)  
End of year 44 41 40
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
FVA at beginning of year 41 40  
Actual return on plan assets 9 8  
Employer contributions 0 0  
Plan participants’ contributions 2 1  
Benefit payments (8) (8)  
FVA at end of year $ 44 $ 41 $ 40