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Policyholder Account Balances (Summary of Policyholder Account Balances by Ranges) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 115,714 $ 113,972  
4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.01%    
UL and Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 37,106 37,258 $ 37,719
UL and Other [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 27,457 27,776  
UL and Other [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 158 156  
UL and Other [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 203 195  
UL and Other [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 26 29  
UL and Other [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,577 3,574  
UL and Other [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 888 $ 833  
Minimum Crediting Rate 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 $ 312 $ 318  
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 202 194  
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 26 29  
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 348 292  
UL and Other [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,784 3,840  
UL and Other [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 555 558  
UL and Other [Member] | 1.01% to 2.00% [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,229 3,282  
UL and Other [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 7,288 7,374  
UL and Other [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 7,130 7,218  
UL and Other [Member] | 2.01% to 3.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 158 156  
UL and Other [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 15,694 15,859  
UL and Other [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 15,693 15,858  
UL and Other [Member] | 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] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 3,767 $ 3,824  
Minimum Crediting Rate 4.01% 4.01%  
UL and Other [Member] | 4.01% and Above [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 3,767 $ 3,824  
UL and Other [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,685 5,528  
Variable Annuities [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 23,771 22,184 19,148
Variable Annuities [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,151 2,218  
Variable Annuities [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances   $ 8  
Variable Annuities [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 8    
Variable Annuities [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.00% 1.00%  
Variable Annuities [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 12 $ 12  
Variable Annuities [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4 4  
Variable Annuities [Member] | 1.01% to 2.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances   8  
Variable Annuities [Member] | 1.01% to 2.00% [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 8    
Variable Annuities [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 634 658  
Variable Annuities [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 634 658  
Variable Annuities [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,503 1,545  
Variable Annuities [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,503 1,545  
Variable Annuities [Member] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 10 $ 11  
Minimum Crediting Rate   4.01%  
Variable Annuities [Member] | 4.01% and Above [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 10 $ 11  
Variable Annuities [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 21,612 19,958  
Fixed Annuity [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 23,993 23,338 22,522
Fixed Annuity [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,915 4,920  
Fixed Annuity [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 594 649  
Fixed Annuity [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 764 772  
Fixed Annuity [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 941 1,055  
Fixed Annuity [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,856 2,388  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 4,077 $ 3,871  
Minimum Crediting Rate 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 $ 831 $ 892  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 447 497  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 578 589  
Fixed Annuity [Member] | Minimum Crediting Rate Up to 1.00% | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 448 563  
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 1,773 1,330  
Fixed Annuity [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,460 2,422  
Fixed Annuity [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 559 546  
Fixed Annuity [Member] | 1.01% to 2.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 141 145  
Fixed Annuity [Member] | 1.01% to 2.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 184 181  
Fixed Annuity [Member] | 1.01% to 2.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 493 492  
Fixed Annuity [Member] | 1.01% to 2.00% [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,083 1,058  
Fixed Annuity [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,894 2,005  
Fixed Annuity [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,886 1,996  
Fixed Annuity [Member] | 2.01% to 3.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 6 7  
Fixed Annuity [Member] | 2.01% to 3.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2 2  
Fixed Annuity [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,446 1,293  
Fixed Annuity [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,446 1,293  
Fixed Annuity [Member] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 193 $ 193  
Minimum Crediting Rate 4.01% 4.01%  
Fixed Annuity [Member] | 4.01% and Above [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 193 $ 193  
Fixed Annuity [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 13,923 13,554  
Retirement Plan Services Segment [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 24,994 25,138 $ 23,579
Retirement Plan Services Segment [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 11,705 12,579  
Retirement Plan Services Segment [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,380 3,200  
Retirement Plan Services Segment [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,258 5,286  
Retirement Plan Services Segment [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,438 2,165  
Retirement Plan Services Segment [Member] | Greater Then 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,213 1,908  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 9,532 $ 9,877  
Minimum Crediting Rate 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 $ 595 $ 961  
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 751 1,001  
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 3,062 4,304  
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 2,911 1,703  
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 2,213 1,908  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,329 5,415  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 977 1,774  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,629 2,197  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,196 982  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 527 462  
Retirement Plan Services Segment [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,093 2,712  
Retirement Plan Services Segment [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 3,093 2,711  
Retirement Plan Services Segment [Member] | 2.01% to 3.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances   1  
Retirement Plan Services Segment [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,442 5,623  
Retirement Plan Services Segment [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances 5,442 5,622  
Retirement Plan Services Segment [Member] | 3.01% to 4.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances   1  
Retirement Plan Services Segment [Member] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 1,598 $ 1,511  
Minimum Crediting Rate 4.01% 4.01%  
Retirement Plan Services Segment [Member] | 4.01% and Above [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 1,598 $ 1,511  
Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 5,850 $ 6,054  
Minimum [Member] | UL and Other [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
Minimum [Member] | UL and Other [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
Minimum [Member] | UL and Other [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
Minimum [Member] | Variable Annuities [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
Minimum [Member] | Variable Annuities [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
Minimum [Member] | Variable Annuities [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
Minimum [Member] | Fixed Annuity [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
Minimum [Member] | Fixed Annuity [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
Minimum [Member] | Fixed Annuity [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
Minimum [Member] | Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
Minimum [Member] | Retirement Plan Services Segment [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
Minimum [Member] | Retirement Plan Services Segment [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
Maximum [Member] | UL and Other [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
Maximum [Member] | UL and Other [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
Maximum [Member] | UL and Other [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%  
Maximum [Member] | Variable Annuities [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
Maximum [Member] | Variable Annuities [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
Maximum [Member] | Variable Annuities [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%  
Maximum [Member] | Fixed Annuity [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
Maximum [Member] | Fixed Annuity [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
Maximum [Member] | Fixed Annuity [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%  
Maximum [Member] | Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
Maximum [Member] | Retirement Plan Services Segment [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
Maximum [Member] | Retirement Plan Services Segment [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%