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Contractholder Funds - Guaranteed Minimum Interest Rate (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Excess of crediting rates over GMIR      
Total policyholder account value $ 27,450.2 $ 26,760.3  
Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Total policyholder account value 20,898.9 20,191.1  
Workplace savings and retirement solutions | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 12,605.3 12,125.1  
Policyholder account value without GMIR 1,775.1 1,857.7  
Total policyholder account value 14,380.4 13,982.8 $ 12,721.5
Workplace savings and retirement solutions | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,510.7 1,486.9  
Workplace savings and retirement solutions | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4,416.1 4,783.3  
Workplace savings and retirement solutions | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 6,657.4 5,833.4  
Workplace savings and retirement solutions | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 7.6 7.6  
Workplace savings and retirement solutions | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 13.5 13.9  
Workplace savings and retirement solutions | At GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3,596.1 3,753.1  
Workplace savings and retirement solutions | At GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3,406.0 3,727.0  
Workplace savings and retirement solutions | At GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 169.0 4.6  
Workplace savings and retirement solutions | At GMIR | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 7.6 7.6  
Workplace savings and retirement solutions | At GMIR | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 13.5 13.9  
Workplace savings and retirement solutions | Up to 0.50% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 0.2 186.9  
Workplace savings and retirement solutions | Up to 0.50% above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 0.2 186.9  
Workplace savings and retirement solutions | 0.51% to 1.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2.3 1.8  
Workplace savings and retirement solutions | 0.51% to 1.00% above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2.3 1.8  
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4,843.1 4,998.0  
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 236.8 1,041.7  
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,010.1 1,056.3  
Workplace savings and retirement solutions | 1.01% to 2.00% above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3,596.2 2,900.0  
Workplace savings and retirement solutions | 2.01% or more above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4,163.6 3,185.3  
Workplace savings and retirement solutions | 2.01% or more above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,273.9 445.2  
Workplace savings and retirement solutions | 2.01% or more above GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 2,889.7 $ 2,740.1  
Workplace savings and retirement solutions | Minimum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Workplace savings and retirement solutions | Minimum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Workplace savings and retirement solutions | Minimum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Workplace savings and retirement solutions | Minimum | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Workplace savings and retirement solutions | Maximum | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Workplace savings and retirement solutions | Maximum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Workplace savings and retirement solutions | Maximum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Workplace savings and retirement solutions | Maximum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%  
Individual variable annuities | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 244.0 $ 254.5  
Policyholder account value without GMIR 1,984.2 1,491.5  
Total policyholder account value 2,228.2 1,746.0 514.2
Individual variable annuities | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 17.1 19.2  
Individual variable annuities | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3.5 3.8  
Individual variable annuities | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 223.4 231.5  
Individual variable annuities | At GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 244.0 254.5  
Individual variable annuities | At GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 17.1 19.2  
Individual variable annuities | At GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3.5 3.8  
Individual variable annuities | At GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 223.4 $ 231.5  
Individual variable annuities | Minimum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Individual variable annuities | Minimum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Individual variable annuities | Minimum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Individual variable annuities | Minimum | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Individual variable annuities | Maximum | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Individual variable annuities | Maximum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Individual variable annuities | Maximum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Individual variable annuities | Maximum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%  
Individual fixed deferred annuities | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 4,120.2 $ 4,284.6  
Policyholder account value without GMIR 170.1 177.7  
Total policyholder account value 4,290.3 4,462.3 5,538.3
Individual fixed deferred annuities | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,523.1 1,586.7  
Individual fixed deferred annuities | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 129.1 139.5  
Individual fixed deferred annuities | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,329.6 2,416.4  
Individual fixed deferred annuities | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 138.4 142.0  
Individual fixed deferred annuities | At GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,738.9 2,850.3  
Individual fixed deferred annuities | At GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 196.0 213.1  
Individual fixed deferred annuities | At GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 74.9 78.8  
Individual fixed deferred annuities | At GMIR | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,329.6 2,416.4  
Individual fixed deferred annuities | At GMIR | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 138.4 142.0  
Individual fixed deferred annuities | Up to 0.50% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 19.7 27.8  
Individual fixed deferred annuities | Up to 0.50% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 19.5 27.5  
Individual fixed deferred annuities | Up to 0.50% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 0.2 0.3  
Individual fixed deferred annuities | 0.51% to 1.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 49.9 60.8  
Individual fixed deferred annuities | 0.51% to 1.00% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 46.4 56.0  
Individual fixed deferred annuities | 0.51% to 1.00% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 3.5 4.8  
Individual fixed deferred annuities | 1.01% to 2.00% above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 195.0 245.1  
Individual fixed deferred annuities | 1.01% to 2.00% above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 152.4 196.9  
Individual fixed deferred annuities | 1.01% to 2.00% above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 42.6 48.2  
Individual fixed deferred annuities | 2.01% or more above GMIR | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,116.7 1,100.6  
Individual fixed deferred annuities | 2.01% or more above GMIR | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,108.8 1,093.2  
Individual fixed deferred annuities | 2.01% or more above GMIR | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 7.9 $ 7.4  
Individual fixed deferred annuities | Minimum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Individual fixed deferred annuities | Minimum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Individual fixed deferred annuities | Minimum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Individual fixed deferred annuities | Minimum | 4.01% and above | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Individual fixed deferred annuities | Maximum | Up to 1.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Individual fixed deferred annuities | Maximum | 1.01% - 2.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Individual fixed deferred annuities | Maximum | 2.01% - 3.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Individual fixed deferred annuities | Maximum | 3.01% - 4.00% | Retirement and Income Solutions      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%  
Universal life | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 5,893.4 $ 5,925.1  
Policyholder account value without GMIR 1,016.2 1,005.3  
Total policyholder account value 6,909.6 6,930.4 $ 6,910.4
Universal life | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 23.3 21.3  
Universal life | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,676.5 1,663.5  
Universal life | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,381.0 2,425.1  
Universal life | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,760.9 1,763.3  
Universal life | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 51.7 51.9  
Universal life | At GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 2,478.7 2,497.8  
Universal life | At GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 261.9 268.6  
Universal life | At GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 625.5 646.0  
Universal life | At GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,570.0 1,559.7  
Universal life | At GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 21.3 23.5  
Universal life | Up to 0.50% above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 674.6 691.4  
Universal life | Up to 0.50% above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 623.3 632.2  
Universal life | Up to 0.50% above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 47.1 56.7  
Universal life | Up to 0.50% above GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 4.2 2.5  
Universal life | 0.51% to 1.00% above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,218.1 1,238.9  
Universal life | 0.51% to 1.00% above GMIR | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1.4 1.5  
Universal life | 0.51% to 1.00% above GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 424.8 424.0  
Universal life | 0.51% to 1.00% above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 753.3 771.9  
Universal life | 0.51% to 1.00% above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 30.6 34.5  
Universal life | 0.51% to 1.00% above GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 8.0 7.0  
Universal life | 1.01% to 2.00% above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 1,036.9 1,026.5  
Universal life | 1.01% to 2.00% above GMIR | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 14.6 14.9  
Universal life | 1.01% to 2.00% above GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 525.0 518.6  
Universal life | 1.01% to 2.00% above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 372.9 368.7  
Universal life | 1.01% to 2.00% above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 106.2 105.4  
Universal life | 1.01% to 2.00% above GMIR | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 18.2 18.9  
Universal life | 2.01% or more above GMIR | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 485.1 470.5  
Universal life | 2.01% or more above GMIR | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 7.3 4.9  
Universal life | 2.01% or more above GMIR | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 464.8 452.3  
Universal life | 2.01% or more above GMIR | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR 6.0 6.3  
Universal life | 2.01% or more above GMIR | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
Policyholder account value with GMIR $ 7.0 $ 7.0  
Universal life | Minimum | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 1.01% 1.01%  
Universal life | Minimum | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 2.01% 2.01%  
Universal life | Minimum | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 3.01% 3.01%  
Universal life | Minimum | 4.01% and above | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 4.01% 4.01%  
Universal life | Maximum | Up to 1.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 1.00% 1.00%  
Universal life | Maximum | 1.01% - 2.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 2.00% 2.00%  
Universal life | Maximum | 2.01% - 3.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 3.00% 3.00%  
Universal life | Maximum | 3.01% - 4.00% | Benefits and Protection | Life Insurance      
Excess of crediting rates over GMIR      
GMIR 4.00% 4.00%