Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit (Income) Cost

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

	Pension				Postretirement				Pension				Postretirement
	For the Six Months Ended June 30,								For the Three Months Ended June 30,
(in millions)	2021		2020		2021		2020		2021		2020		2021		2020
Service cost	$	34	$	37	$	10	$	8	$	17	$	18	$	5	$	4
Interest cost	93		126		21		30		47		63		10		15
Expected return on plan assets	(262)		(251)		(8)		(7)		(131)		(125)		(4)		(4)
Amortization:
Net loss	66		53		14		7		33		26		7		4
Prior service cost (credit)	2		2		(15)		(15)		1		1		(9)		(8)
Net periodic benefit (income) cost	$	(67)	$	(33)	$	22	$	23	$	(33)	$	(17)	$	9	$	11