Employee Benefit Plans

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

8.    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 September 30
Service cost	$	40	$	35	$	1	$	1
Interest cost	19		21		2		3
Expected return on plan assets	(48)		(44)		—		—
Amortization of:
Net actuarial loss	21		18		—		—
Prior service credit	(5)		(4)		(2)		(2)
Special charges	3		2		—		—
Net periodic benefit cost	$	30	$	28	$	1	$	2
Nine months ended September 30
Service cost	$	121	$	105	$	4	$	4
Interest cost	55		64		5		7
Expected return on plan assets	(144)		(134)		—		—
Amortization of:
Net actuarial loss	61		55		—		—
Prior service credit	(14)		(14)		(5)		(5)
Special charges	7		3		—		—
Net periodic benefit cost	$	86	$	79	$	4	$	6

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.”

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 nine months ended September 30, 2021, we contributed $121 million and $12 million to our pension and other postretirement benefit plans, respectively. During the nine months ended September 30, 2020, we contributed $28 million and $12 million to our pension and other postretirement benefit plans, respectively.