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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost (credit) for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows.
Qualified Defined Benefit Pension PlanThree Months Ended March 31,
(in millions)20252024
Service cost$9 $8 
Other components of net benefit credit:
Interest cost21 21 
Expected return on plan assets(44)(45)
Amortization of prior service credit(4)(3)
Amortization of net loss 6 6 
Total other components of net benefit credit(21)(21)
Net periodic defined benefit credit$(12)$(13)
Non-Qualified Defined Benefit Pension PlanThree Months Ended March 31,
(in millions)20252024
Service cost$1 $1 
Other components of net benefit cost:
Interest cost2 2 
Amortization of prior service credit(1)(2)
Amortization of net loss1 1 
Total other components of net benefit cost2 1 
Net periodic defined benefit cost$3 $2 
Postretirement Benefit PlanThree Months Ended March 31,
(in millions)20252024
Other components of net benefit credit:
Expected return on plan assets$(1)$(1)
Net periodic defined benefit credit$(1)$(1)