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Policyholder Account Balances - Summary of Policyholder Account Balances by Ranges (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 120,737 $ 114,435  
Variable Annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balances 29,141 22,184 $ 19,148
Variable Annuities | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,961 2,218  
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 8  
Variable Annuities | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 7 $ 0  
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 12 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 8  
Variable Annuities | 1.01% - 2.00% | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 7 0  
Variable Annuities | 2.01% - 3.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 576 658  
Variable Annuities | 2.01% - 3.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 576 658  
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 1,370 1,545  
Variable Annuities | 3.01% - 4.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,370 1,545  
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 $ 10 $ 11  
Variable Annuities | 4.01% and above | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 10 11  
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 27,173 19,958  
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 $ 25,355 $ 23,365 22,552
Fixed Annuities | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,035 4,954  
Fixed Annuities | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 643 646  
Fixed Annuities | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 787 769  
Fixed Annuities | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,032 1,055  
Fixed Annuities | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 5,528 $ 2,386  
Fixed Annuities | Up to 1.00%      
Policyholder Account Balance [Line Items]      
Range of guaranteed minimum crediting rate 1.00% 1.00%  
Policyholder account balances $ 4,687 $ 3,869  
Fixed Annuities | Up to 1.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 696 891  
Fixed Annuities | Up to 1.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 511 497  
Fixed Annuities | Up to 1.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 546 589  
Fixed Annuities | Up to 1.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 505 563  
Fixed Annuities | Up to 1.00% | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,429 1,329  
Fixed Annuities | 1.01% - 2.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,366 2,416  
Fixed Annuities | 1.01% - 2.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 426 544  
Fixed Annuities | 1.01% - 2.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 97 144  
Fixed Annuities | 1.01% - 2.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 235 179  
Fixed Annuities | 1.01% - 2.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 527 492  
Fixed Annuities | 1.01% - 2.00% | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,081 1,057  
Fixed Annuities | 2.01% - 3.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,865 1,979  
Fixed Annuities | 2.01% - 3.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,806 1,973  
Fixed Annuities | 2.01% - 3.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 35 5  
Fixed Annuities | 2.01% - 3.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 6 1  
Fixed Annuities | 2.01% - 3.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 0  
Fixed Annuities | 2.01% - 3.00% | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 18 0  
Fixed Annuities | 3.01% - 4.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 927 1,353  
Fixed Annuities | 3.01% - 4.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 927 1,353  
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 $ 180 $ 193  
Fixed Annuities | 4.01% and above | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 180 193  
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 13,330 13,555  
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 $ 37,180 $ 37,694 38,200
UL and Other | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 27,074 28,200  
UL and Other | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 11 156  
UL and Other | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 344 195  
UL and Other | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 121 29  
UL and Other | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 3,477 $ 3,574  
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 $ 943 $ 833  
UL and Other | Up to 1.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 275 318  
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 195 194  
UL and Other | Up to 1.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 121 29  
UL and Other | Up to 1.00% | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 352 292  
UL and Other | 1.01% - 2.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,682 3,840  
UL and Other | 1.01% - 2.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 557 558  
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 3,125 3,282  
UL and Other | 2.01% - 3.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 7,084 7,374  
UL and Other | 2.01% - 3.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 6,925 7,218  
UL and Other | 2.01% - 3.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 11 156  
UL and Other | 2.01% - 3.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 148 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 15,588 16,283  
UL and Other | 3.01% - 4.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 15,587 16,282  
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 $ 3,730 $ 3,824  
UL and Other | 4.01% and above | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,730 3,824  
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 6,153 5,540  
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 $ 23,784 $ 25,138 $ 23,579
Retirement Plan Services | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 10,116 12,579  
Retirement Plan Services | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,634 3,200  
Retirement Plan Services | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,319 5,286  
Retirement Plan Services | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,736 2,165  
Retirement Plan Services | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 2,979 $ 1,908  
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 $ 9,648 $ 9,877  
Retirement Plan Services | Up to 1.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 452 961  
Retirement Plan Services | Up to 1.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 569 1,001  
Retirement Plan Services | Up to 1.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 744 4,304  
Retirement Plan Services | Up to 1.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,904 1,703  
Retirement Plan Services | Up to 1.00% | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,979 1,908  
Retirement Plan Services | 1.01% - 2.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,022 5,415  
Retirement Plan Services | 1.01% - 2.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 550 1,774  
Retirement Plan Services | 1.01% - 2.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,065 2,197  
Retirement Plan Services | 1.01% - 2.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,575 982  
Retirement Plan Services | 1.01% - 2.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 832 462  
Retirement Plan Services | 1.01% - 2.00% | Greater Than 150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 0  
Retirement Plan Services | 2.01% - 3.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,492 2,712  
Retirement Plan Services | 2.01% - 3.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,492 2,711  
Retirement Plan Services | 2.01% - 3.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 1  
Retirement Plan Services | 2.01% - 3.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 0  
Retirement Plan Services | 2.01% - 3.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 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 5,012 5,623  
Retirement Plan Services | 3.01% - 4.00% | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,012 5,622  
Retirement Plan Services | 3.01% - 4.00% | 1-50 Basis Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 1  
Retirement Plan Services | 3.01% - 4.00% | 51-100 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 0  
Retirement Plan Services | 3.01% - 4.00% | 101-150 Basis Points Above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0 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 $ 1,610 $ 1,511  
Retirement Plan Services | 4.01% and above | At Guaranteed Minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,610 1,511  
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%