Employee Benefit Plans

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

7.    EMPLOYEE BENEFIT PLANS

The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):

	Pension Plans				Other Postretirement Benefit Plans
	2021		2020		2021		2020
Three months ended March 31
Service cost	$	40	$	35	$	2	$	1
Interest cost	18		21		2		2
Expected return on plan assets	(48)		(44)		—		—
Amortization of:
Net actuarial loss	20		18		—		—
Prior service credit	(4)		(5)		(2)		(1)
Net periodic benefit cost	$	26	$	25	$	2	$	2

The components of net periodic benefit cost other than the service cost component (i.e., the non-service cost components) are included in “other income, net” in the statements of income.

As previously disclosed in our annual report on Form 10-K for the year ended December 31, 2020, we plan to contribute approximately $128 million to our pension plans and $22 million to our other postretirement benefit plans during 2021. During the three months ended March 31, 2021 and 2020, we contributed $21 million and $12 million, respectively, to our pension plans and $3 million and $4 million, respectively, to our other postretirement benefit plans.