Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Schedule of Changes in Accumulated Postretirement Benefits Obligations

Changes in Accumulated Postretirement Benefit Obligations:	2017			2016
Obligation at the Beginning of Year	$	814		$	783
Unrecognized Loss (Gain)	226			24
Components of Net Periodic Postretirement Benefit Cost
Service Cost	50			41
Interest Cost	29			29
Net Expected Benefit Payments	(58		)	(63		)
Obligation at End of Year	$	1,061		$	814

Schedule of Components of Postretirement Benefit Expense

Components of Postretirement Benefit Expense:	2017		2016		2015
Service Cost	$	50	$	41	$	42
Interest Cost	29		29		26
Amortization of Unrecognized Net (Gain) Loss	8		6		5
Net Postretirement Benefit Expense	87		76		73
Net (Gain) Loss During Period Recognized in Other Comprehensive Income (Loss)	218		18		17
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income	$	305	$	94	$	90

Schedule of Assumptions Used to Determine Net Periodic Cost and Benefit Obligations

Assumptions Used to Determine Net Periodic Cost and Benefit Obligations:	2017		2016		2015
Discount Rate	3.35	%	3.72	%	3.82	%

Schedule of Assumption of Health Care Cost Trend Rates at Year-end

Assumed Health Care Cost Trend Rates at Year-end:	2017		2016
Health Care Cost Trend Rate Assumed for Next Year	8.00	%	8.00	%
Rate that the Cost Trend Rate Gradually Declines to	5.00	%	5.00	%
Year that the Rate Reaches the Rate it is Assumed to Remain at	2023		2022

Schedule of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

A one-percentage-point change in assumed health care cost trend rates would have the following effects as of December 31, 2017:

	One-Percentage-Point Increase		One-Percentage-Point Decrease
Effect on Total of Service and Interest Cost	$	7	$	(6	)
Effect on Postretirement Benefit Obligation	$	66	$	(59	)

Schedule of Estimated Future Benefits

The following postretirement benefit payments, which reflect expected future service, are expected to be paid:

2018	$	84
2019	91
2020	86
2021	77
2022	85
2023-2027	547