Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit (Income) Cost

Net periodic benefit (income) cost consisted of the following:

	For the Three Months Ended March 31,
	Pension				Postretirement
(in millions)	2021		2020		2021		2020
Service cost	$	17	$	19	$	5	$	4
Interest cost	46		63		11		15
Expected return on plan assets	(131)		(126)		(4)		(3)
Amortization:
Net loss	33		27		7		3
Prior service cost (credit)	1		1		(6)		(7)
Net periodic benefit (income) cost	$	(34)	$	(16)	$	13	$	12