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Policyholder Account Balances (Summary of Policyholder Account Balances by Ranges) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 116,777 $ 113,972  
UL and Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 36,810 37,258 $ 37,719
UL and Other [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 27,003 27,776  
UL and Other [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 11 156  
UL and Other [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 340 195  
UL and Other [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 34 29  
UL and Other [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 3,543 3,574  
UL and Other [Member] | Minimum Crediting Rate Up to 1.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 872 $ 833  
Minimum Crediting Rate 1.00% 1.00%  
UL and Other [Member] | Minimum Crediting Rate Up to 1.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 284 $ 318  
UL and Other [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 192 194  
UL and Other [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 34 29  
UL and Other [Member] | Minimum Crediting Rate Up to 1.00% [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 362 292  
UL and Other [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 3,734 3,840  
UL and Other [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 553 558  
UL and Other [Member] | 1.01% to 2.00% [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 3,181 3,282  
UL and Other [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 7,156 7,374  
UL and Other [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 6,998 7,218  
UL and Other [Member] | 2.01% to 3.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 11 156  
UL and Other [Member] | 2.01% to 3.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 147    
UL and Other [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 15,386 15,859  
UL and Other [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 15,385 15,858  
UL and Other [Member] | 3.01% to 4.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 1 1  
UL and Other [Member] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 3,783 $ 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 Funds $ 3,783 $ 3,824  
UL and Other [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 5,879 $ 5,528  
UL and Other [Member] | Minimum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
UL and Other [Member] | Minimum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
UL and Other [Member] | Minimum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
UL and Other [Member] | Maximum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
UL and Other [Member] | Maximum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
UL and Other [Member] | Maximum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%  
Variable Annuities [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 26,772 $ 22,184 19,148
Variable Annuities [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 2,046 2,218  
Variable Annuities [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds   $ 8  
Variable Annuities [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 8    
Variable Annuities [Member] | Minimum Crediting Rate Up to 1.00% [Member]      
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 Funds $ 13 $ 12  
Variable Annuities [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 5 4  
Variable Annuities [Member] | 1.01% to 2.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds   8  
Variable Annuities [Member] | 1.01% to 2.00% [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 8    
Variable Annuities [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 602 658  
Variable Annuities [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 602 658  
Variable Annuities [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 1,429 1,545  
Variable Annuities [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 1,429 1,545  
Variable Annuities [Member] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 10 $ 11  
Minimum Crediting Rate 4.01% 4.01%  
Variable Annuities [Member] | 4.01% and Above [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 10 $ 11  
Variable Annuities [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 24,718 $ 19,958  
Variable Annuities [Member] | Minimum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
Variable Annuities [Member] | Minimum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
Variable Annuities [Member] | Minimum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
Variable Annuities [Member] | Maximum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
Variable Annuities [Member] | Maximum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
Variable Annuities [Member] | Maximum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%  
Fixed Annuities [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 23,655 $ 23,338 22,522
Fixed Annuities [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 4,217 4,927  
Fixed Annuities [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 565 646  
Fixed Annuities [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 733 769  
Fixed Annuities [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 974 1,055  
Fixed Annuities [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 3,694 2,386  
Fixed Annuities [Member] | Minimum Crediting Rate Up to 1.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 4,631 $ 3,869  
Minimum Crediting Rate 1.00% 1.00%  
Fixed Annuities [Member] | Minimum Crediting Rate Up to 1.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 744 $ 891  
Fixed Annuities [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 427 497  
Fixed Annuities [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 515 589  
Fixed Annuities [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 518 563  
Fixed Annuities [Member] | Minimum Crediting Rate Up to 1.00% [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 2,427 1,329  
Fixed Annuities [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 2,519 2,416  
Fixed Annuities [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 481 544  
Fixed Annuities [Member] | 1.01% to 2.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 106 144  
Fixed Annuities [Member] | 1.01% to 2.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 212 179  
Fixed Annuities [Member] | 1.01% to 2.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 456 492  
Fixed Annuities [Member] | 1.01% to 2.00% [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 1,264 1,057  
Fixed Annuities [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 1,922 1,979  
Fixed Annuities [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 1,881 1,973  
Fixed Annuities [Member] | 2.01% to 3.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 32 5  
Fixed Annuities [Member] | 2.01% to 3.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 6 1  
Fixed Annuities [Member] | 2.01% to 3.00% [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 3    
Fixed Annuities [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 929 1,326  
Fixed Annuities [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 929 1,326  
Fixed Annuities [Member] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 182 $ 193  
Minimum Crediting Rate 4.01% 4.01%  
Fixed Annuities [Member] | 4.01% and Above [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 182 $ 193  
Fixed Annuities [Member] | Minimum Crediting Rate Other [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 13,472 $ 13,555  
Fixed Annuities [Member] | Minimum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
Fixed Annuities [Member] | Minimum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
Fixed Annuities [Member] | Minimum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
Fixed Annuities [Member] | Maximum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
Fixed Annuities [Member] | Maximum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
Fixed Annuities [Member] | Maximum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%  
Retirement Plan Services Segment [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 24,099 $ 25,138 $ 23,579
Retirement Plan Services Segment [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 10,475 12,579  
Retirement Plan Services Segment [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 3,001 3,200  
Retirement Plan Services Segment [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 2,236 5,286  
Retirement Plan Services Segment [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 5,550 2,165  
Retirement Plan Services Segment [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 2,837 1,908  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 9,484 $ 9,877  
Minimum Crediting Rate 1.00% 1.00%  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 407 $ 961  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 1-50 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 596 1,001  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 51-100 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 762 4,304  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 4,882 1,703  
Retirement Plan Services Segment [Member] | Minimum Crediting Rate Up to 1.00% [Member] | Greater Than 150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 2,837 1,908  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 5,157 5,415  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 610 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 Funds 2,405 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 Funds 1,474 982  
Retirement Plan Services Segment [Member] | 1.01% to 2.00% [Member] | 101-150 Basis Points Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 668 462  
Retirement Plan Services Segment [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 2,594 2,712  
Minimum Crediting Rate 3.00%    
Retirement Plan Services Segment [Member] | 2.01% to 3.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 2,594 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 Funds   1  
Retirement Plan Services Segment [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 5,223 5,623  
Retirement Plan Services Segment [Member] | 3.01% to 4.00% [Member] | Guaranteed Minimum Crediting Rate [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds 5,223 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 Funds   1  
Retirement Plan Services Segment [Member] | 4.01% and Above [Member]      
Policyholder Account Balance [Line Items]      
Policyholder Funds $ 1,641 $ 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 Funds $ 1,641 $ 1,511  
Retirement Plan Services Segment [Member] | Minimum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 1.01% 1.01%  
Retirement Plan Services Segment [Member] | Minimum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.01% 2.01%  
Retirement Plan Services Segment [Member] | Minimum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.01% 3.01%  
Retirement Plan Services Segment [Member] | Maximum [Member] | 1.01% to 2.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 2.00% 2.00%  
Retirement Plan Services Segment [Member] | Maximum [Member] | 2.01% to 3.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 3.00% 3.00%  
Retirement Plan Services Segment [Member] | Maximum [Member] | 3.01% to 4.00% [Member]      
Policyholder Account Balance [Line Items]      
Minimum Crediting Rate 4.00% 4.00%