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Policyholder Account Balances - Schedule of Policyholder Account Balances (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | $ 122,300 | $ 120,737 |  |
Variable Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 31,408 | 29,141 | $ 23,771 | $ 22,184
Fixed Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 25,162 | 25,355 | 24,019 | 23,365
UL and Other |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 37,006 | 37,180 | 37,533 | 37,694
Retirement Plan Services |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 23,586 | 23,784 | $ 24,994 | $ 25,138
Other |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 5,138 | 5,277 |  |
Other | Reinsurance Agreement |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | $ 4,700 | $ 4,900 |  |

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