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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Changes in Accumulated Postretirement Benefits Obligations
Changes in Accumulated Postretirement Benefit Obligations:
 
2015
 
2014
Obligation at the Beginning of Year
 
$
746

 
$
671

Unrecognized Loss (Gain)
 
22

 
46

 
 
 
 
 
Components of Net Periodic Postretirement Benefit Cost
 
 

 
 

Service Cost
 
42

 
41

Interest Cost
 
26

 
28

 
 
 
 
 
Net Expected Benefit Payments
 
(53
)
 
(40
)
Obligation at End of Year
 
$
783

 
$
746
Components of Postretirement Benefit Expense
Components of Postretirement Benefit Expense:
 
2015
 
2014
 
2013
Service Cost
 
$
42

 
$
41

 
$
40

Interest Cost
 
26

 
28

 
23

Amortization of Unrecognized Net (Gain) Loss
 
5

 
—

 
4

Net Postretirement Benefit Expense
 
73

 
69

 
67

 
 
 
 
 
 
 
Net (Gain) Loss During Period Recognized in Other Comprehensive Income (Loss)
 
17

 
46

 
(37
)
 
 
 
 
 
 
 
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income
 
$
90

 
$
115

 
$
30
Schedule of Assumptions Used to Determine Net Periodic Cost and Benefit Obligations
Assumptions Used to Determine Net Periodic Cost and Benefit Obligations:
 
2015
 
2014
 
2013
Discount Rate
 
3.82
%
 
3.62
%
 
4.31
%
Schedule of Assumption of Health Care Cost Trend Rates at Year-end
Assumed Health Care Cost Trend Rates at Year-end:
 
2015
 
2014
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
 
2021

 
2020
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, 2015:
 
 
One-Percentage-Point
Increase
 
One-Percentage-Point
Decrease
Effect on Total of Service and Interest Cost
 
$
6

 
$
(5
)
Effect on Postretirement Benefit Obligation
 
$
43

 
$
(39
)
Schedule of Estimated Future Benefits
The following postretirement benefit payments, which reflect expected future service, are expected to be paid:
2016
 
$
62

2017
 
71

2018
 
76

2019
 
76

2020
 
81

2021-2025
 
356