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Retirement and Employee Benefit Plans (Schedule of Health Care Cost Trend Rates) (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Retirement Benefits [Abstract]    
Health care cost trend assumed for next year 6.50% 6.50%
Rate to which the cost trend is assumed to decline 5.00% 5.00%
Year that the rate reaches the ultimate trend rate 2038 2037