Employee Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2020

Employee Retirement Plans [Abstract]

Net Periodic Benefit Expense

	Pension benefits								Postretirement benefits
	Three months ended				Nine months ended				Three months ended				Nine months ended
	September 30,				September 30,				September 30,				September 30,
	2020		2019		2020		2019		2020		2019		2020		2019
Service cost	$	29	$	25	$	87	$	76	$	2	$	3	$	7	$	7
Interest cost		32		37		94		111		5		7		15		21
Expected return on plan assets		(49)		(42)		(147)		(128)
Amortization of actuarial net gain										1		(1)		1		(1)
Amortization of prior service ‎   cost (credit)		1		2		4		5		(2)		(2)		(5)		(6)
Recognition of actuarial (gain) loss						(2)		23
Total pension and postretirement ‎   benefit expense	$	13	$	22	$	36	$	87	$	6	$	7	$	18	$	21