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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2024
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 September 30,Nine Months Ended September 30,
(in millions)2024202320242023
Service cost$8 $8 $25 $23 
Other components of net benefit credit:
Interest cost20 21 62 64 
Expected return on plan assets(44)(41)(134)(124)
Amortization of prior service credit(4)(3)(11)(10)
Amortization of net loss 6 8 17 24 
Total other components of net benefit credit(22)(15)(66)(46)
Net periodic defined benefit credit$(14)$(7)$(41)$(23)
Non-Qualified Defined Benefit Pension PlanThree Months Ended September 30,Nine Months Ended September 30,
(in millions)2024202320242023
Service cost$1 $1 $2 $2 
Other components of net benefit cost:
Interest cost2 2 6 6 
Amortization of prior service credit(2)(3)(5)(7)
Amortization of net loss1 1 3 3 
Total other components of net benefit cost1 — 4 2 
Net periodic defined benefit cost$2 $1 $6 $4 
Postretirement Benefit PlanThree Months Ended September 30,Nine Months Ended September 30,
(in millions)2024202320242023
Other components of net benefit credit:
Interest cost$1 $1 $1 $1 
Expected return on plan assets(1)(1)(2)(2)
Net periodic defined benefit credit$— $— $(1)$(1)