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Policyholder Account Balances - Summary of Policyholder Account Balances by Ranges (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 122,300 $ 120,737    
Variable Annuities        
Policyholder Account Balance [Line Items]        
Policyholder account balances 31,408 29,141 $ 23,771 $ 22,184
Variable Annuities | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,893   2,151  
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 $ 6   $ 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 11   12  
Variable Annuities | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 5   4  
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 6   8  
Variable Annuities | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 560   634  
Variable Annuities | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 560   634  
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 1,319   1,503  
Variable Annuities | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,319   1,503  
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 $ 9   $ 10  
Variable Annuities | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 9   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 29,509   21,612  
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 $ 25,162 25,355 $ 24,019 23,365
Fixed Annuities | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,881   4,941  
Fixed Annuities | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 743   594  
Fixed Annuities | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 850   764  
Fixed Annuities | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 994   941  
Fixed Annuities | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 5,722   $ 2,856  
Fixed Annuities | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 4,803   $ 4,077  
Fixed Annuities | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 679   831  
Fixed Annuities | Up to 1.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 605   447  
Fixed Annuities | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 560   578  
Fixed Annuities | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 493   448  
Fixed Annuities | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,466   1,773  
Fixed Annuities | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,475   2,460  
Fixed Annuities | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 360   559  
Fixed Annuities | 1.01% - 2.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 99   141  
Fixed Annuities | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 285   184  
Fixed Annuities | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 500   493  
Fixed Annuities | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,231   1,083  
Fixed Annuities | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,819   1,893  
Fixed Annuities | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,749   1,885  
Fixed Annuities | 2.01% - 3.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 39   6  
Fixed Annuities | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 5   2  
Fixed Annuities | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1   0  
Fixed Annuities | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 25   0  
Fixed Annuities | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 916   1,473  
Fixed Annuities | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 916   1,473  
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 $ 177   $ 193  
Fixed Annuities | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 177   193  
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 12,972   13,923  
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 $ 37,006 37,180 $ 37,533 37,694
UL and Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 26,978   27,872  
UL and Other | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 10   158  
UL and Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 369   203  
UL and Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 119   26  
UL and Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 3,238   $ 3,577  
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 $ 632   $ 888  
UL and Other | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 264   312  
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 219   202  
UL and Other | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 119   26  
UL and Other | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 30   348  
UL and Other | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,756   3,785  
UL and Other | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 548   556  
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 3,208   3,229  
UL and Other | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 7,007   7,288  
UL and Other | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6,848   7,130  
UL and Other | 2.01% - 3.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 10   158  
UL and Other | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 149   0  
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 15,597   16,108  
UL and Other | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 15,596   16,107  
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 $ 3,722   $ 3,767  
UL and Other | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,722   3,767  
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 6,292   5,697  
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 $ 23,586 $ 23,784 $ 24,994 $ 25,138
Retirement Plan Services | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 9,606   11,705  
Retirement Plan Services | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,355   3,380  
Retirement Plan Services | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,219   4,258  
Retirement Plan Services | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 5,071   3,438  
Retirement Plan Services | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 4,335   $ 2,213  
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 $ 9,703   $ 9,532  
Retirement Plan Services | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 437   595  
Retirement Plan Services | Up to 1.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 500   751  
Retirement Plan Services | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 740   3,062  
Retirement Plan Services | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,706   2,911  
Retirement Plan Services | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,320   2,213  
Retirement Plan Services | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,959   5,329  
Retirement Plan Services | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 527   977  
Retirement Plan Services | 1.01% - 2.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,660   2,629  
Retirement Plan Services | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,413   1,196  
Retirement Plan Services | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,345   527  
Retirement Plan Services | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 14   0  
Retirement Plan Services | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,444   3,093  
Retirement Plan Services | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,342   3,093  
Retirement Plan Services | 2.01% - 3.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 21   0  
Retirement Plan Services | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 63   0  
Retirement Plan Services | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 17   0  
Retirement Plan Services | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1   0  
Retirement Plan Services | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,879   5,442  
Retirement Plan Services | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,842   5,442  
Retirement Plan Services | 3.01% - 4.00% | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 31   0  
Retirement Plan Services | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3   0  
Retirement Plan Services | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3   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 $ 1,601   $ 1,598  
Retirement Plan Services | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,458   1,598  
Retirement Plan Services | 4.01% and above | 1-50 Basis Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 143   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%