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Policyholder Account Balances - Schedule of Policyholder Account Balances (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | $ 124,113 | $ 120,737 |  |
Variable Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 32,853 | 29,141 | $ 26,257 | $ 22,184
Fixed Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 25,837 | 25,355 | 23,813 | 23,365
UL and Other |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 36,848 | 37,180 | 37,458 | 37,694
Retirement Plan Services |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 23,598 | 23,784 | $ 24,430 | $ 25,138
Other |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 4,977 | 5,277 |  |
Other | Reinsurance Agreement |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | $ 4,600 | $ 4,900 |  |

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