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Policyholder Account Balances (Summary of Policyholder Account Balances by Ranges) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 114,435 $ 110,227  
Ul and Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 37,694 38,200 $ 38,185
Ul and Other [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 28,200 28,636  
Ul and Other [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 156 157  
Ul and Other [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 195 570  
Ul and Other [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 29 30  
Ul and Other [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,574 3,589  
Ul and Other [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 833 $ 1,157  
Guaranteed Minimum Credit Rating 1.00% 1.00%  
Ul and Other [Member] | Minimum Crediting Rate Up to 1.00% | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 318 $ 331  
Ul and Other [Member] | Minimum Crediting Rate Up to 1.00% | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 194 569  
Ul and Other [Member] | Minimum Crediting Rate Up to 1.00% | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 29 30  
Ul and Other [Member] | Minimum Crediting Rate Up to 1.00% | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 292 227  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,840 3,893  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 558 531  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,282 3,362  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 7,374 7,437  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 7,218 7,280  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 156 157  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 16,283 16,663  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 16,282 16,662  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1 1  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 3,824 $ 3,832  
Guaranteed Minimum Credit Rating 4.01% 4.01%  
Ul and Other [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 3,824 $ 3,832  
Ul and Other [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 5,540 $ 5,218  
Ul and Other [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 1.01% 1.01%  
Ul and Other [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.01% 2.01%  
Ul and Other [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.01% 3.01%  
Ul and Other [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.00% 2.00%  
Ul and Other [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.00% 3.00%  
Ul and Other [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 4.00% 4.00%  
Variable Annuities [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 22,184 $ 19,148 12,145
Variable Annuities [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,218 2,280  
Variable Annuities [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 8 $ 9  
Variable Annuities [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 1.00% 1.00%  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 12 $ 14  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4 5  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 8 9  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 658 687  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 658 687  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,545 1,576  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,545 1,576  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 11 $ 12  
Guaranteed Minimum Credit Rating 4.01% 4.01%  
Variable Annuities [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 11 $ 12  
Variable Annuities [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 19,958 $ 16,859  
Variable Annuities [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 1.01% 1.01%  
Variable Annuities [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.01% 2.01%  
Variable Annuities [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.01% 3.01%  
Variable Annuities [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.00% 2.00%  
Variable Annuities [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.00% 3.00%  
Variable Annuities [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 4.00% 4.00%  
Fixed Annuity [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 23,365 $ 22,552 23,168
Fixed Annuity [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,954 4,884  
Fixed Annuity [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 646 759  
Fixed Annuity [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 769 1,037  
Fixed Annuity [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,055 1,396  
Fixed Annuity [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,386 1,594  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 3,869 $ 3,724  
Guaranteed Minimum Credit Rating 1.00% 1.00%  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 891 $ 656  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 497 710  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 589 869  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 563 921  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,329 568  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,416 2,277  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 544 594  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 144 32  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 179 156  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 492 469  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,057 1,026  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,979 2,249  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,973 2,214  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5 17  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1 12  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances   6  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,353 1,220  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,353 1,220  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 193 $ 200  
Guaranteed Minimum Credit Rating 4.01% 4.01%  
Fixed Annuity [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 193 $ 200  
Fixed Annuity [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 13,555 $ 12,882  
Fixed Annuity [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 1.01% 1.01%  
Fixed Annuity [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.01% 2.01%  
Fixed Annuity [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.01% 3.01%  
Fixed Annuity [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.00% 2.00%  
Fixed Annuity [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.00% 3.00%  
Fixed Annuity [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 4.00% 4.00%  
Retirement Plan Services Segment [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 25,138 $ 23,579 $ 22,916
Retirement Plan Services Segment [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 12,579 14,248  
Retirement Plan Services Segment [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,200 3,646  
Retirement Plan Services Segment [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,286 2,478  
Retirement Plan Services Segment [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,165 1,278  
Retirement Plan Services Segment [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,908 1,929  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 9,877 $ 8,092  
Guaranteed Minimum Credit Rating 1.00% 1.00%  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 961 $ 1,054  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,001 2,613  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,304 1,683  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,703 813  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,908 1,929  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,415 5,027  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,774 2,736  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,197 1,031  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 982 795  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 462 465  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,712 2,892  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,711 2,891  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1 1  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,623 5,928  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,622 5,927  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1 1  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 1,511 $ 1,640  
Guaranteed Minimum Credit Rating 4.01% 4.01%  
Retirement Plan Services Segment [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 4.01 And Greater [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 1,511 $ 1,640  
Retirement Plan Services Segment [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 1.01% 1.01%  
Retirement Plan Services Segment [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.01% 2.01%  
Retirement Plan Services Segment [Member] | Minimum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.01% 3.01%  
Retirement Plan Services Segment [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 1.01 To 2.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 2.00% 2.00%  
Retirement Plan Services Segment [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 2.01 To 3.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 3.00% 3.00%  
Retirement Plan Services Segment [Member] | Maximum [Member] | Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 3.01 To 4.00 [Member]      
Policyholder Account Balance [Line Items]      
Guaranteed Minimum Credit Rating 4.00% 4.00%  
Other Operations [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 6,054 $ 6,748