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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
Mar. 31, 2020
May 31, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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)     3.25% 2.50% 2.50% 3.25%  
Interest crediting rate - cash balance benefit       5.00% 5.00%    
Weighted-average assumptions used to determine net periodic benefit cost              
Discount rate: Net periodic benefit cost (as a percent)   4.15% 3.70%   3.25% 3.70% 3.60%
Expected long-term return on plan assets: Net periodic benefit cost (as a percent)         5.60% 5.95% 6.30%
Interest crediting rate - cash balance benefit         5.00%    
Pension benefits, Cash balance benefit              
Weighted-average assumptions used to determine benefit obligations as disclosed under the Obligations and Funded Status section              
Rate of compensation increase: Benefit obligation (as a percent)     4.95% 4.92% 4.92% 4.95%  
Weighted-average assumptions used to determine net periodic benefit cost              
Rate of compensation increase: Net periodic benefit cost (as a percent)         4.95% 4.94% 4.96%
Pension benefits, Traditional benefit              
Weighted-average assumptions used to determine benefit obligations as disclosed under the Obligations and Funded Status section              
Rate of compensation increase: Benefit obligation (as a percent)     2.98% 2.96% 2.96% 2.98%  
Weighted-average assumptions used to determine net periodic benefit cost              
Rate of compensation increase: Net periodic benefit cost (as a percent)         2.98% 2.73% 2.77%
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)     2.95% 2.10% 2.10% 2.95%  
Weighted-average assumptions used to determine net periodic benefit cost              
Discount rate: Net periodic benefit cost (as a percent) 2.95%     2.90% 2.95% 3.95% 3.35%
Expected long-term return on plan assets: Net periodic benefit cost (as a percent)         4.94% 5.19% 4.85%
Rate of compensation increase: Net periodic benefit cost (as a percent)             2.39%
Subsidy increase cap allowed per calendar year (as a percent) 5.00%            
Assumed Health Care Cost Trend Rates              
Health care cost trend rate assumed for next year under age 65 (as a percent)     6.75% 6.75% 6.75% 6.75%  
Health care cost trend rate assumed for next year age 65 and over (as a percent)     6.00% 6.00% 6.00% 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% 4.50%  
Year that the health care cost trend rate reaches the ultimate trend rate under age 65 (calendar year)         2029 2028  
Year that the health care cost trend rate reaches the ultimate trend rate age 65 and over (calendar year)         2026 2025  
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)         5.00%    
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)         4.70%    
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)         4.70%