Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2022

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 Plan	Three Months Ended March 31,
(in millions)	2022		2021
Service cost	$	9	$	10
Other components of net benefit credit:
Interest cost	16		15
Expected return on plan assets	(50)		(50)
Amortization of prior service credit	(4)		(5)
Amortization of net loss	5		7
Total other components of net benefit credit	(33)		(33)
Net periodic defined benefit credit	$	(24)	$	(23)

Non-Qualified Defined Benefit Pension Plan	Three Months Ended March 31,
(in millions)	2022		2021
Service cost	$	1	$	—
Other components of net benefit cost:
Interest cost	1		2
Amortization of prior service credit	(2)		(1)
Amortization of net loss	2		3
Total other components of net benefit cost	1		4
Net periodic defined benefit cost	$	2	$	4

Postretirement Benefit Plan	Three Months Ended March 31,
(in millions)	2022		2021
Other components of net benefit credit:
Expected return on plan assets	$	—	$	(1)
Net periodic defined benefit credit	$	—	$	(1)