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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
(in millions)2024202320242023
Service cost$9 $7 $17 $15 
Other components of net benefit credit:
Interest cost21 22 42 43 
Expected return on plan assets(45)(42)(90)(83)
Amortization of prior service credit(4)(3)(7)(7)
Amortization of net loss 5 8 11 16 
Total other components of net benefit credit(23)(15)(44)(31)
Net periodic defined benefit credit$(14)$(8)$(27)$(16)
Non-Qualified Defined Benefit Pension PlanThree Months Ended June 30,Six Months Ended June 30,
(in millions)2024202320242023
Service cost$— $— $1 $1 
Other components of net benefit cost:
Interest cost2 2 4 4 
Amortization of prior service credit(1)(2)(3)(4)
Amortization of net loss1 1 2 2 
Total other components of net benefit cost2 1 3 2 
Net periodic defined benefit cost$2 $1 $4 $3 
Postretirement Benefit PlanThree Months Ended June 30,Six Months Ended June 30,
(in millions)2024202320242023
Other components of net benefit credit:
Expected return on plan assets$— $— $(1)$(1)
Net periodic defined benefit credit$— $— $(1)$(1)