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Policyholder Account Balances - Summary of Policyholder Account Balances by Ranges (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 125,968 $ 120,737    
Variable Annuities        
Policyholder Account Balance [Line Items]        
Policyholder account balances 34,344 29,141 $ 26,772 $ 22,184
Variable Annuities | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,791   2,046  
Variable Annuities | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 7   $ 8  
Variable Annuities | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 0   $ 0  
Variable Annuities | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Up to 1.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 10   13  
Variable Annuities | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3   5  
Variable Annuities | 1.01% - 2.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 7   8  
Variable Annuities | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 523   602  
Variable Annuities | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 523   602  
Variable Annuities | 2.01% - 3.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,257   1,429  
Variable Annuities | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,257   1,429  
Variable Annuities | 3.01% - 4.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Variable Annuities | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 8   $ 10  
Variable Annuities | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 8   10  
Variable Annuities | 4.01% and above | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances 32,546   24,718  
Variable Annuities | Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Variable Annuities | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
Variable Annuities | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
Variable Annuities | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
Variable Annuities | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
Variable Annuities | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
Variable Annuities | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%  
Fixed Annuities        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 26,359 25,355 $ 23,681 23,365
Fixed Annuities | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,820   4,243  
Fixed Annuities | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 913   565  
Fixed Annuities | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 826   733  
Fixed Annuities | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 614   974  
Fixed Annuities | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 7,099   $ 3,694  
Fixed Annuities | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 4,540   $ 4,631  
Fixed Annuities | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 436   744  
Fixed Annuities | Up to 1.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 730   427  
Fixed Annuities | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 620   515  
Fixed Annuities | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 373   518  
Fixed Annuities | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,381   2,427  
Fixed Annuities | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 5,522   2,519  
Fixed Annuities | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 253   481  
Fixed Annuities | 1.01% - 2.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 145   106  
Fixed Annuities | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 200   212  
Fixed Annuities | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 239   456  
Fixed Annuities | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,685   1,264  
Fixed Annuities | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,728   1,922  
Fixed Annuities | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,649   1,881  
Fixed Annuities | 2.01% - 3.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 38   32  
Fixed Annuities | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6   6  
Fixed Annuities | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2   0  
Fixed Annuities | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 33   3  
Fixed Annuities | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,312   955  
Fixed Annuities | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,312   955  
Fixed Annuities | 3.01% - 4.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Fixed Annuities | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 170   $ 182  
Fixed Annuities | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 170   182  
Fixed Annuities | 4.01% and above | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances 13,087   13,472  
Fixed Annuities | Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Fixed Annuities | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
Fixed Annuities | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
Fixed Annuities | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
Fixed Annuities | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
Fixed Annuities | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
Fixed Annuities | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%  
UL and Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 36,692 37,180 $ 37,217 37,694
UL and Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 26,473   27,398  
UL and Other | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 10   11  
UL and Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 374   340  
UL and Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 121   34  
UL and Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 3,213   $ 3,543  
UL and Other | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 656   $ 872  
UL and Other | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 261   284  
UL and Other | Up to 1.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 222   192  
UL and Other | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 121   34  
UL and Other | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 52   362  
UL and Other | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,714   3,734  
UL and Other | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 553   553  
UL and Other | 1.01% - 2.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,161   3,181  
UL and Other | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6,812   7,156  
UL and Other | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6,651   6,998  
UL and Other | 2.01% - 3.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 10   11  
UL and Other | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 151   147  
UL and Other | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 15,427   15,781  
UL and Other | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 15,426   15,780  
UL and Other | 3.01% - 4.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1   1  
UL and Other | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
UL and Other | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 3,582   $ 3,783  
UL and Other | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,582   3,783  
UL and Other | 4.01% and above | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6,501   5,891  
UL and Other | Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
UL and Other | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
UL and Other | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
UL and Other | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
UL and Other | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
UL and Other | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
UL and Other | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%  
Retirement Plan Services        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 23,727 $ 23,784 $ 24,099 $ 25,138
Retirement Plan Services | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 9,334   10,475  
Retirement Plan Services | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,512   3,001  
Retirement Plan Services | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,685   2,236  
Retirement Plan Services | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,416   5,550  
Retirement Plan Services | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 5,780   $ 2,837  
Retirement Plan Services | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 10,227   $ 9,484  
Retirement Plan Services | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 515   407  
Retirement Plan Services | Up to 1.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 287   596  
Retirement Plan Services | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 731   762  
Retirement Plan Services | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,417   4,882  
Retirement Plan Services | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 5,277   2,837  
Retirement Plan Services | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,938   5,157  
Retirement Plan Services | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 470   610  
Retirement Plan Services | 1.01% - 2.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,028   2,405  
Retirement Plan Services | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,947   1,474  
Retirement Plan Services | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 990   668  
Retirement Plan Services | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 503   0  
Retirement Plan Services | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,367   2,594  
Retirement Plan Services | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,253   2,594  
Retirement Plan Services | 2.01% - 3.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 112   0  
Retirement Plan Services | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1   0  
Retirement Plan Services | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1   0  
Retirement Plan Services | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,592   5,223  
Retirement Plan Services | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,493   5,223  
Retirement Plan Services | 3.01% - 4.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 85   0  
Retirement Plan Services | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6   0  
Retirement Plan Services | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 8   0  
Retirement Plan Services | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Retirement Plan Services | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 1,603   $ 1,641  
Retirement Plan Services | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,603   1,641  
Retirement Plan Services | 4.01% and above | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Retirement Plan Services | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
Retirement Plan Services | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
Retirement Plan Services | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
Retirement Plan Services | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
Retirement Plan Services | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
Retirement Plan Services | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%