Benefit Plans (Tables)

9 Months Ended

Sep. 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 Nine Months Ended September 30,								For the Three Months Ended September 30,
(in millions)	2021		2020		2021		2020		2021		2020		2021		2020
Service cost	$	51	$	55	$	15	$	13	$	17	$	18	$	5	$	5
Interest cost	139		188		29		44		46		62		8		14
Expected return on plan assets	(393)		(376)		(10)		(11)		(131)		(125)		(2)		(4)
Amortization:
Net loss	99		108		16		7		33		55		2		—
Prior service cost (credit)	3		4		(35)		(22)		1		2		(20)		(7)
Net periodic benefit (income) cost	$	(101)	$	(21)	$	15	$	31	$	(34)	$	12	$	(7)	$	8