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Policyholders' Account Balances - Policyholder Account Balance, Guaranteed Minimum Crediting Rate (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 82,413 $ 17,177  
Annuity      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 78,737 14,694 $ 12,012
Annuity | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 7,876 4,244  
Annuity | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 3,666 $ 875  
Annuity | 1 - 50 Basis Points Above | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Basis points 0.0001 0.0001  
Annuity | 1 - 50 Basis Points Above | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Basis points 0.0050 0.0050  
Annuity | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 5,230 $ 2,483  
Annuity | 51 - 150 Basis Points Above | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Basis points 0.0051 0.0051  
Annuity | 51 - 150 Basis Points Above | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Basis points 0.0150 0.0150  
Annuity | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Basis points 0.0150 0.0150  
Policyholders' account balances – investment contracts, excluding embedded derivative $ 14,891 $ 7,084  
Annuity | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 47,074 8  
Annuity | 0% - 1%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 15,497 $ 3,719  
Annuity | 0% - 1% | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 0.00% 0.00%  
Annuity | 0% - 1% | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 1.00% 1.00%  
Annuity | 0% - 1% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 4,176 $ 2,485  
Annuity | 0% - 1% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 2,882 29  
Annuity | 0% - 1% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 3,676 483  
Annuity | 0% - 1% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 4,763 722  
Annuity | 0% - 1% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Annuity | 1% - 2%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 5,046 $ 5,178  
Annuity | 1% - 2% | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 1.00% 1.00%  
Annuity | 1% - 2% | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 2.00% 2.00%  
Annuity | 1% - 2% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 1,504 $ 668  
Annuity | 1% - 2% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 366 430  
Annuity | 1% - 2% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 1,411 1,943  
Annuity | 1% - 2% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 1,765 2,137  
Annuity | 1% - 2% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Annuity | 2% - 3%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 10,815 $ 5,516  
Annuity | 2% - 3% | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 2.00% 2.00%  
Annuity | 2% - 3% | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 3.00% 3.00%  
Annuity | 2% - 3% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 1,907 $ 827  
Annuity | 2% - 3% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 412 409  
Annuity | 2% - 3% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 142 56  
Annuity | 2% - 3% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 8,354 4,224  
Annuity | 2% - 3% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 0 $ 0  
Annuity | Greater than 3%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 3.00% 3.00%  
Policyholders' account balances – investment contracts, excluding embedded derivative $ 305 $ 273  
Annuity | Greater than 3% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 289 264  
Annuity | Greater than 3% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 6 7  
Annuity | Greater than 3% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 1 1  
Annuity | Greater than 3% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 9 1  
Annuity | Greater than 3% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 47,074 8  
Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 47,074 8  
Life      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 2,068 1,975 $ 1,899
Life | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 1,088 1,242  
Life | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 2 2  
Life | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 279 359  
Life | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 699 371  
Life | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 1  
Life | 0% - 1%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 0 $ 0  
Life | 0% - 1% | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 0.00% 0.00%  
Life | 0% - 1% | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 1.00% 1.00%  
Life | 0% - 1% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 0 $ 0  
Life | 0% - 1% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | 0% - 1% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | 0% - 1% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | 0% - 1% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | 1% - 2%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 788 $ 681  
Life | 1% - 2% | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 1.00% 1.00%  
Life | 1% - 2% | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 2.00% 2.00%  
Life | 1% - 2% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 30 $ 168  
Life | 1% - 2% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 2 2  
Life | 1% - 2% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 57 140  
Life | 1% - 2% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 699 371  
Life | 1% - 2% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | 2% - 3%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 644 $ 634  
Life | 2% - 3% | Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 2.00% 2.00%  
Life | 2% - 3% | Maximum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 3.00% 3.00%  
Life | 2% - 3% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 422 $ 415  
Life | 2% - 3% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | 2% - 3% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 222 219  
Life | 2% - 3% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | 2% - 3% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 0 $ 0  
Life | Greater than 3%      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Range of Guaranteed Minimum Crediting Rate 3.00% 3.00%  
Policyholders' account balances – investment contracts, excluding embedded derivative $ 636 $ 659  
Life | Greater than 3% | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 636 659  
Life | Greater than 3% | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Greater than 3% | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Greater than 3% | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Greater than 3% | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Products with either a fixed rate or no guaranteed minimum crediting rate      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 1  
Life | Products with either a fixed rate or no guaranteed minimum crediting rate | At Guaranteed Minimum      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Products with either a fixed rate or no guaranteed minimum crediting rate | 1 - 50 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Products with either a fixed rate or no guaranteed minimum crediting rate | 51 - 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Products with either a fixed rate or no guaranteed minimum crediting rate | > 150 Basis Points Above      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative 0 0  
Life | Products with either a fixed rate or no guaranteed minimum crediting rate | Other      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]      
Policyholders' account balances – investment contracts, excluding embedded derivative $ 0 $ 1