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Employee and Agent Benefits - Weighted Average Assumptions (Details)
 3 Months Ended 5 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
May 31, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension benefits                
Weighted-average assumptions used to determine benefit obligations as disclosed under the Obligations and Funded Status section                
Discount rate: Benefit obligation (as a percent)         2.50% 2.75% 2.50%  
Interest crediting rate - cash balance benefit         5.00% 5.00% 5.00%  
Rate of compensation increase: Benefit obligation (as a percent)         4.41% 4.59% 4.41%  
Weighted-average assumptions used to determine net periodic benefit cost                
Discount rate: Net periodic benefit cost (as a percent)     4.15% 3.70%   2.50% 3.25% 3.70%
Expected long-term return on plan assets: Net periodic benefit cost (as a percent)           5.55% 5.60% 5.95%
Interest crediting rate - cash balance benefit           5.00% 5.00%  
Pension benefits, Cash balance benefit                
Weighted-average assumptions used to determine net periodic benefit cost                
Rate of compensation increase: Net periodic benefit cost (as a percent)           4.92% 4.95% 4.94%
Pension benefits, Traditional benefit                
Weighted-average assumptions used to determine net periodic benefit cost                
Rate of compensation increase: Net periodic benefit cost (as a percent)           2.96% 2.98% 2.73%
Other postretirement benefits                
Weighted-average assumptions used to determine benefit obligations as disclosed under the Obligations and Funded Status section                
Discount rate: Benefit obligation (as a percent)         2.10% 2.50% 2.10%  
Weighted-average assumptions used to determine net periodic benefit cost                
Discount rate: Net periodic benefit cost (as a percent)   2.95%     2.90% 2.10% 2.95% 3.95%
Expected long-term return on plan assets: Net periodic benefit cost (as a percent)           4.25% 4.94% 5.19%
Assumed Health Care Cost Trend Rates                
Health care cost trend rate assumed for next year under age 65 (as a percent)         6.75% 7.00% 6.75%  
Health care cost trend rate assumed for next year age 65 and over (as a percent)         6.00% 6.50% 6.00%  
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate) (as a percent)         4.50% 4.50% 4.50%  
Year that the health care cost trend rate reaches the ultimate trend rate under age 65 (calendar year)           2030 2029  
Year that the health care cost trend rate reaches the ultimate trend rate age 65 and over (calendar year)           2029 2026  
Home office medical and life plans                
Weighted-average assumptions used to determine net periodic benefit cost                
Expected long-term return on plan assets: Net periodic benefit cost (as a percent)           4.25%    
Agent medical and life plans                
Weighted-average assumptions used to determine net periodic benefit cost                
Expected long-term return on plan assets: Net periodic benefit cost (as a percent)           4.25%    
Long-term care plans                
Weighted-average assumptions used to determine net periodic benefit cost                
Subsidy increase cap allowed per calendar year (as a percent) 5.00%              
Post-65 medical plans                
Weighted-average assumptions used to determine net periodic benefit cost                
Expected long-term return on plan assets: Net periodic benefit cost (as a percent)           4.25%