Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Plans [Abstract]

Net Periodic Pension And OPEB Cost/(Benefit)

The components of our net periodic pension cost were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Millions	2021		2020		2021		2020
Service cost	$	25	$	19	$	85	$	72
Interest cost		25		33		78		102
Expected return on plan assets		(67)		(71)		(202)		(211)
Amortization of actuarial loss		35		27		106		79
Net periodic pension cost	$	18	$	8	$	67	$	42

The components of our net periodic OPEB costs were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Millions	2021		2020		2021		2020
Service cost	$	-	$	-	$	1	$	1
Interest cost		-		1		2		4
Amortization of:
Prior service cost/(credit)		(3)		(3)		(10)		(10)
Actuarial loss		2		1		5		5
Net periodic OPEB cost	$	(1)	$	(1)	$	(2)	$	-

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