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Pension and Postretirement Plans (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
investment
country
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
investment
country
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
investment
Defined Benefit Plan Disclosure [Line Items]              
Special separation benefit expense     $ 7,783     $ 13,797  
Defined Benefit Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Special separation benefit expense $ 0   7,783   $ 1,118 $ 13,797  
Percent of plan assets managed internally by the company         40.00%    
Percent of plan assets managed by investment companies         60.00%    
Number of investment companies actively managing plan assets | country 2       2    
Percentage of total plan assets 100.00%       100.00%   100.00%
Berkshire Hathaway Common Stock [Member] | Defined Benefit Pension Plan [Member] | Investment Manager 2 [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator         20.00%    
Alphabet and Berkshire Hathaway Common Stock [Member] | Defined Benefit Pension Plan [Member] | Investment Manager 1 [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator         15.00%    
Foreign Investments [Member] | Defined Benefit Pension Plan [Member] | Maximum [Member] | Investment Manager 1 [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, target allocation percentage of assets 30.00%       30.00%    
Foreign Investments [Member] | Defined Benefit Pension Plan [Member] | Maximum [Member] | Investment Manager 2 [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, target allocation percentage of assets 15.00%       15.00%    
Fixed income securities [Member] | Defined Benefit Pension Plan [Member] | Minimum [Member] | Investment Manager 2 [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, target allocation percentage of assets 10.00%       10.00%    
Private investment fund [Member] | Defined Benefit Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Percentage of total plan assets 18.00%       18.00%   18.00%
Single Equity Concentration [Member] | Defined Benefit Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, target allocation maximum percentage of assets, singular equity security, without prior approval by plan administrator         10.00%   10.00%
Value of investments $ 967,000       $ 967,000   $ 850,600
Percentage of total plan assets 30.00%       30.00%   30.00%
Single Equity Concentration [Member] | Equity Securities [Member] | Defined Benefit Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Number of investments the company's pension plan held which individually exceed 10% of total plan assets | investment 1       1   1
Single Equity Concentration [Member] | Private investment fund [Member] | Defined Benefit Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Number of investments the company's pension plan held which individually exceed 10% of total plan assets | investment 1       1   1
Concentration In Single Entity, Type Of Industry, Foreign Country Or Individual Fund [Member] | Defined Benefit Plan Assets Total [Member] | Defined Benefit Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Minimum percentage of plan assets considered as significant concentrations in pension plans         10.00%    
Education [Member] | Defined Benefit Pension Plan [Member] | Separation Incentive Program [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Special separation benefit expense     $ 7,800        
Education, Code3 and Decile [Member] | Defined Benefit Pension Plan [Member] | Separation Incentive Program [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Special separation benefit expense       $ 6,000      
Dekko [Member] | Defined Benefit Pension Plan [Member] | Separation Incentive Program [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Special separation benefit expense   $ 1,100