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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2023
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)2023202220232022
Service cost$$$23 $28 
Other components of net benefit credit:
Interest cost21 16 64 47 
Expected return on plan assets(41)(51)(124)(151)
Amortization of prior service credit(3)(4)(10)(11)
Amortization of net loss 24 14 
Total other components of net benefit credit(15)(35)(46)(101)
Net periodic defined benefit credit$(7)$(26)$(23)$(73)
Non-Qualified Defined Benefit Pension PlanThree Months Ended September 30,Nine Months Ended September 30,
(in millions)2023202220232022
Service cost$$$$
Other components of net benefit cost:
Interest cost
Amortization of prior service credit(3)(2)(7)(7)
Amortization of net loss
Total other components of net benefit cost— 
Net periodic defined benefit cost$$$$
Postretirement Benefit PlanThree Months Ended September 30,Nine Months Ended September 30,
(in millions)2023202220232022
Other components of net benefit credit:
Interest cost$$$$
Expected return on plan assets(1)(1)(2)(2)
Net periodic defined benefit credit$— $— $(1)$(1)