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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Changes in Accumulated Postretirement Benefits Obligations
Changes in Accumulated Postretirement Benefit Obligations:20212020
Obligation at the Beginning of Year$1,634 $1,498 
Unrecognized Loss (Gain)(68)114 
Components of Net Periodic Postretirement Benefit Cost
Service Cost119 110 
Interest Cost28 41 
Net Expected Benefit Payments(121)(96)
Amendments (33)
Obligation at End of Year$1,592 $1,634 
Schedule of Components of Postretirement Benefit Expense
Components of Postretirement Benefit Expense:202120202019
Service Cost$119 $110 $83 
Interest Cost28 41 43 
Amortization of Prior Service Costs(2)— 
Amortization of Unrecognized Net (Gain) Loss55 64 37 
Net Postretirement Benefit Expense200 217 163 
Net Gain (Loss) During Period Recognized in Other Comprehensive Income (Loss)(121)15 273 
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income$79 $232 $436 
Schedule of Assumptions Used to Determine Net Periodic Cost and Benefit Obligations
Assumptions Used to Determine Net Periodic Cost and Benefit Obligations:202120202019
Discount Rate2.31 %1.81 %2.81 %
Schedule of Assumption of Health Care Cost Trend Rates at Year-end
Assumed Health Care Cost Trend Rates at Year-end:20212020
Health Care Cost Trend Rate Assumed for Next Year8.00 %8.00 %
Rate that the Cost Trend Rate Gradually Declines to4.50 %4.50 %
Year that the Rate Reaches the Rate it is Assumed to Remain at20282027
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, 2021:
One-Percentage-Point
Increase
One-Percentage-Point
Decrease
Effect on Total of Service and Interest Cost$17 $(15)
Effect on Postretirement Benefit Obligation$116 $(103)
Schedule of Estimated Future Benefits The following postretirement benefit payments, which reflect expected future service, are expected to be paid:
2022$131 
2023138 
2024112 
2025119 
2026138 
2027-2031749