Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Net periodic benefit costs

The components of net periodic benefit costs, reported in other expenses, were as follows:

	Three Months Ended March 31,
	2021				2020
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
	(In millions)
Service costs	$	63	$	1	$	62	$	1
Interest costs	78		8		89		10
Expected return on plan assets	(132)		(14)		(132)		(15)
Amortization of net actuarial (gains) losses	38		(20)		45		(19)
Amortization of prior service costs (credit)	(4)		—		(4)		(1)
Net periodic benefit costs (credit)	$	43	$	(25)	$	60	$	(24)